Cheese Stuffed Tostadas

Name: Cheese-Stuffed Tostadas
Ingredients: 2 tablespoons extra-virgin olive oil, plus more for brushing; 1 clove garlic, peeled and sliced; 2 tablespoons finely chopped fresh cilantro, plus leaves for serving; ½ teaspoon ground cumin; 1 can (15 ounces) black beans, not drained; 1 tablespoon chopped chipotle chile in adobo sauce; Kosher salt and freshly ground pepper; 8 corn tortillas (5-inch); 5 ounces Monterey Jack, grated (1 heaping cup); Shredded lettuce, sliced radishes, and salsa, for serving