SHEET-PAN TOSTADAS WITH BLACK BEANS AND PEPPERS

Steps:

• Heat oven to 400 degrees and arrange racks in the top and bottom thirds of oven. On a rimmed sheet pan, toss together peppers, onion, 1/4 cup oil, 1/2 teaspoon salt and sage, then spread vegetables out in an even layer. Top with thyme sprigs, and roast on the top rack until tender and lightly browned, 35 to 45 minutes, tossing every 15 minutes or so.
• On a separate rimmed sheet pan, toss together beans, tomatoes, 1/4 cup oil, chipotle chile and sauce, garlic, oregano, 1/2 teaspoon cumin and salt to taste. Roast on the bottom rack, stirring every 10 minutes, until juices have thickened, 25 to 35 minutes.
• Brush tortillas on both sides with oil, then arrange in an even layer on a third rimmed baking sheet (it's O.K. if the tortillas overlap slightly). Bake until crisp, about 5 to 7 minutes. Immediately sprinkle with salt while they are still hot.
• To make the cumin salt, grate the zest from the lime. In a small bowl, stir together lime zest, 1 1/2 teaspoons salt, and remaining 1/4 teaspoon cumin. Cut naked lime into wedges.
• To serve, top tortillas with beans, peppers, avocado, queso fresco (if desired), cilantro and a squeeze of lime from the wedges. Let people sprinkle on lime-cumin salt to taste.