Ingredients
5 tbsp. neutral oil, divided
1 small yellow onion, finely chopped
1 tsp. kosher salt, divided
1 tbsp. taco seasoning
1 (15.5-oz.) can black beans, drained, rinsed
8 (6″) yellow corn tortillas, warmed
1 c. shredded Mexican blend cheese
Sour cream, cilantro leaves, and lime wedges, for serving (optional)
How to:
Place a rack in center of oven; preheat to 425°. In a large skillet over medium heat, heat 2 tablespoons oil. Add onion, season with 1/2 teaspoon salt, and cook, stirring occasionally, until softened and sweet to the taste, about 7 minutes. Add taco seasoning and 1 tablespoon oil and cook, stirring, until fragrant, about 30 seconds.
Add beans, remaining 1/2 teaspoon salt, and 1/2 cup water. Bring to a simmer over high heat; reduce heat to medium-low and simmer, mashing down on some beans, until thickened and reduced, 2 to 3 minutes. Remove from heat.
Grease a large metal baking sheet with remaining 2 tablespoons oil. Arrange tortillas in a single layer, making sure that one side of tortilla is coated in oil. Spoon a scant 1/4 cup bean mixture onto one half of each tortilla. Top each with 2 tablespoons cheese. Fold tortillas over cheese to create a taco. Flip tacos so side with cheese is closest to baking sheet.
Bake tacos until golden brown and crisp on the bottom, 8 to 10 minutes. Flip tacos and continue to bake until golden brown and crisp on the other side, 5 to 8 minutes longer.
Transfer tacos to a platter. Serve with sour cream, cilantro, and lime wedges alongside (if using).