Cheese-Stuffed Tostadas

Heat oil in a skillet over medium-high. Add garlic and cook until just golden. Stir in chopped cilantro and cumin, then beans with liquid, chipotle, and 1/2 cup water. Season with salt and pepper. Bring to a boil, then reduce heat and simmer, stirring occasionally, until thickened, 6 to 7 minutes.

Preheat broiler. Place 4 tortillas on a rimmed baking sheet brushed with oil. Divide cheese among them, piled in centers, and top with remaining tortillas. Brush tops with oil. Broil, rotating sheet once, until tops are crisp, 3 to 4 minutes.

Flip and broil until second sides are crisp, 2 to 3 minutes more. Smash beans with the back of a spoon and spread mixture over tostadas. Top with lettuce, radishes, salsa, and cilantro leaves; serve.