Best 13 Onion Au Gratin Recipes

ONIONS AU GRATIN

Steps:

• Cut onions into 1/2-in. slices; saute in butter until tender. Place in a greased 8-in. square baking dish. , In a small bowl, stir the flour, broth, cream, salt and pepper until smooth; pour over onions. Sprinkle with cheeses. , Bake, uncovered, at 350° for 25-30 minutes or until cheese is golden brown and mixture is bubbly.

ONION GRATIN

Steps:

• Spread the onion slices out in a baking dish and drizzle them with olive oil.
• Season with salt and pepper and sprinkle with the thyme.
• Bake in a preheated 375F/190C oven for 15 minutes.
• Meanwhile heat the heavy cream and wine in a sauce pan until it starts to bubble on the edges.
• Spoon the cream over the onions.
• Cover in foil and bake for another 25 minutes.
• Remove the foil and sprinkle the cheese on top.
• Increase the temperature to 450F/230C and bake until golden brown, about 5 minutes.

GRANDMA'S FAMOUS CREAMED ONIONS AU GRATIN

Steps:

• THAW 1 (14 ounce) bag Bird's Eye Frozen petite Whole Onions; LET drain; MINCE 1/4 teaspoon fresh thyme leaves; GRATE 1/2 cup Sharp Cheddar Cheese; SET aside.
• MELT 2 tablespoons butter in a 1-2 quart saucepan over medium heat; ADD drained onions; RAISE heat to medium-high; STIR onions constantly as they cook, until they begin to caramelize.
• SPRINKLE 2 tablespoons flour over onions; STIR for for 1 minute.
• DEGLAZE onions with 1/3 cup dry white wine; ADD the minced thyme; STIR, scraping the bottom, until wine evaporates.
• REDUCE heat to medium-low.
• ADD 1/3 cup cream or half and half; STIR until sauce is warmed and thickened.
• SEASON sauce with 1/4 teaspoon dry mustard (or prepared horseradish), 1 pinch freshly grated nutmeg, 1 pinch ground white pepper, and kosher salt, to taste.
• REMOVE from heat; ADD the grated cheese; STIR until cheese is completely melted.
• GARNISH with thinly snipped chives and SERVE.
• GET READY to melt into your seat after just one taste!

BAKED ONIONS AU GRATIN

Steps:

• Saute onions in butter.
• Place onions in a 9 x 13 casserole dish with a slotted spoon.
• Stir in heavy whipping cream, white wine, and black pepper. Mix well.
• Top with cheeses.
• Bake at 375 degrees for 15-20 minutes.

SWEET ONION POTATOES AU GRATIN

Steps:

• Heat a small skillet with the butter over medium heat. Add the onions, season with salt ground thyme, bay leaf and cook until very soft and sweet and lightly caramelized, 20 minutes. Season with salt and pepper, to taste, and discard the bay leaf.
• While the onions cook, put the potatoes in a medium pot and cover with water. Bring to a boil, then salt the water and cook to tender, 12 to 15 minutes. Drain and return the potatoes to the hot pot. Mash the potatoes with the cream and Parmesan and season with salt and pepper, to taste.
• Preheat the broiler.
• Arrange the mashed potatoes in individual gratin dishes or 1 shallow casserole. Top the potatoes with the onions and Gruyere cheese. Put them on a sheet pan and brown under a hot broiler until bubbly, about 2 minutes. Remove from the oven and serve hot.

FRENCH ONION SOUP POTATO GRATIN

Steps:

• For the caramelized onions: In a large saucepan over medium-high heat, melt the butter. Once melted and bubbling, add a large handful of the onions and cook until translucent, 1 to 2 minutes. Repeat until all the onions have been added. Season with a pinch of salt and black pepper. Reduce the heat to low and cook, stirring occasionally, until the onions turn medium brown, about 30 minutes. If the onions start to get too dark, add 1 to 2 tablespoons of beef stock as necessary. Add the sherry to deglaze the pan. Add the mustard and stir to coat. Season with salt and pepper. Remove from the heat and set aside.
• For the potato gratin: Preheat the oven to 400 degrees F.
• Using a mandoline or a sharp knife, cut the potatoes into thin slices. Do your best to keep the potatoes in a stack--this will make it easier to layer them in the pan. Set the potatoes aside.
• Use the reserved butter wrapper to lightly grease the bottom and sides of a large (12-inch) cast-iron skillet. Discard the wrapper.
• Arrange a thin shingled layer of potatoes in concentric circles around the skillet. Season the potatoes with salt and pepper, then arrange an even layer of caramelized onions on top of the potatoes. Season with salt and pepper.
• In a medium bowl, combine the Gruyere and mozzarella and reserve half for later use. Sprinkle on a layer of the remaining cheese mixture over the onions. Repeat the layers until all the ingredients (not including the reserved cheese) have been used. Press down firmly on the layers to flatten.
• In a large bowl or measuring cup, combine the heavy cream and beef stock and pour over the gratin. Cover the skillet with foil and place on a sheet pan. Bake the potatoes, covered, until the top and edges have begun to brown and the potatoes are tender, 1 hour 15 to 1 hour 30 minutes. You can test by inserting a knife into the potatoes; if it goes in and comes out without resistance, then the potatoes are done.
• Remove the skillet from the oven, remove the foil and turn the broiler on high. Combine the croutons and French fried onions. Cover the gratin with a layer of the crouton mixture followed by the remaining cheese. Broil until golden brown and bubbly, 5 to 8 minutes. Serve and enjoy!

GRATIN OF ONIONS

Steps:

• In a large saucepan mix together the onions, stock, grits, salt and pepper. Bring the mixture to a boil, reduce the heat to low, and cook gently for 20 to 25 minutes, stirring the mixture two or three times to prevent it from sticking to the pan, until the onions and grits are very tender.
• Preheat oven to 400 degrees. Butter a 6-cup gratin dish with about 1/4 teaspoon of the butter and add the remainder of the butter to the onion mixture. Using a hand blender or a food processor, puree the onion-and-grits mixture until it is smooth, and then pour it into the prepared dish. Sprinkle with the cheese.
• Place the gratin in the oven for about 15 minutes if the mixture is still warm when it goes into the oven, or about 30 minutes if the mixture has cooled. If the top needs additional browning, place the gratin under a hot broiler for a few minutes before serving.

FRENCH ONION SOUP GRATINEE

Steps:

• Melt butter in a large pot over medium-high heat. Stir in salt, red onions and sweet onions. Cook 35 minutes, stirring frequently, until onions are caramelized and almost syrupy.
• Mix chicken broth, beef broth, red wine and Worcestershire sauce into pot. Bundle the parsley, thyme, and bay leaf with twine and place in pot. Simmer over medium heat for 20 minutes, stirring occasionally. Remove and discard the herbs. Reduce the heat to low, mix in vinegar and season with salt and pepper. Cover and keep over low heat to stay hot while you prepare the bread.
• Preheat oven broiler. Arrange bread slices on a baking sheet and broil 3 minutes, turning once, until well toasted on both sides. Remove from heat; do not turn off broiler.
• Arrange 4 large oven safe bowls or crocks on a rimmed baking sheet. Fill each bowl 2/3 full with hot soup. Top each bowl with 1 slice toasted bread, 2 slice Gruyere cheese and 1/4 of the Asiago or mozzarella cheese. Sprinkle a little bit of paprika over the top of each one.
• Broil 5 minutes, or until bubbly and golden brown. As it softens, the cheese will cascade over the sides of the crock and form a beautifully melted crusty seal. Serve immediately!

CARROTS AND ONIONS AU GRATIN

Steps:

• Preheat oven to 350 degrees F (175 degrees C).
• Place carrots and onions in a pot with enough lightly salted water to cover, and bring to a boil. Cook 5 minutes, or until tender but firm. Drain, and spread 1/2 the carrots and onions in a baking dish. Cover with 3/4 cup cheese, layer with remaining carrots and onions, and top with remaining cheese.
• In a saucepan, melt 3 tablespoons butter and mix in flour until smooth. Gradually stir in milk until thickened, and season with salt and pepper. Pour over the carrots, onions, and cheese in the baking dish.
• Melt 1 tablespoon butter in a small pot, and mix in bread crumbs. Sprinkle evenly in the baking dish.
• Bake 20 minutes in the preheated oven, or until bubbly and lightly browned.

SIMPLE AU GRATIN POTATOES

Steps:

• Preheat oven to 350°. In a large saucepan, melt butter over low heat. Stir in flour, salt and pepper until smooth. Gradually add milk. Bring to a boil; cook and stir 2 minutes or until thickened. Remove from heat; stir in cheese until melted. Add potatoes and onion., Transfer to a greased 2-qt. baking dish. Cover and bake 1 hour. Uncover; bake 30-40 minutes or until the potatoes are tender. If desired, top with additional pepper.

ONION-PARMESAN GRATIN

Steps:

• Slice the onions in half lengthwise. Place, cut side down, on a cutting board and slice crosswise into very thin slices, and set aside.
• In a large, nonstick skillet, combine the butter, cloves, onions, thyme and salt. Cover and cook over very low heat until the onions are very soft, about 10 minutes. Taste and adjust the seasoning.
• Transfer the onion mixture to a gratin dish and smooth it with the back of a spoon. The recipe can be prepared several hours in advance up to this point. Cover and store at room temperature.
• Preheat the broiler. In a small bowl, combine the egg yolks and cream and whisk together well. Stir in the cheese. Pour the mixture over the onions in the baking dish. Place the baking dish under the broiler about 2 inches from the heat. Broil until the top is sizzling and golden, about 1 to 2 minutes. Serve immediately as a vegetable course or as an accompaniment to meat dishes.

FOUR-ONION GRATIN

Steps:

• Melt butter in heavy large skillet over medium heat. Add leeks, large onions, shallots and garlic and sauté until all are tender, about 20 minutes. Add baby onions and cook 10 minutes longer, stirring occasionally. Mix in 2 cups whipping cream. Boil until cream is thickened to sauce consistency, about 10 minutes. Transfer vegetable-cream mixture to 6-cup shallow baking dish. (Can be prepared 1 day ahead. Cover and refrigerate. Return mixture to room temperature before continuing.)
• Preheat oven to 425°F Sprinkle breadcrumbs over onion mixture. Bake until breadcrumbs are golden brown and onion mixture bubbles, about 20 minutes. Sprinkle with parsley.

MUSHROOM AND ONION GRATINS

Steps:

• In a skillet cook the mushrooms in 2 1/2 tablespoons of the butter over moderately low heat, stirring, until they are softened and most of the liquid they give off has evaporated. Stir in the flour and cook the mixture, stirring, for 3 minutes.
• In each of six 1 1/2-cup gratin dishes layer the onions, the remaining butter, cut into bits, the mushroom mixture, and salt and pepper to taste, beginning and ending with a layer of onions, and pour 1 tablespoon of the cream over the top of each gratin. In a small bowl combine well the Gruyère and the bread crumbs and sprinkle the mixture over the cream. (Alternatively, the gratin, layered in the same manner, may be prepared in one 2-quart gratin dish.) Bake the gratins in the middle of a preheated 325°F. oven for 50 minutes to 1 hour, or until the onions are tender and the tops are golden. The gratins may be prepared 3 hours in advance, kept covered and chilled, and reheated in a preheated 400°F. oven for 5 minutes, or until they are heated through.