Crispy Oven Beef-and-Bean Tostadas

Step 1
Preheat oven to 400 degrees F (200 degrees C).

Step 2
Mix garlic salt, onion powder, garlic powder, cumin, and black pepper together in a small bowl.

Step 3
Heat a large skillet over medium-high heat. Cook and stir beef, onion, and garlic in the hot skillet until browned and crumbly, 5 to 7 minutes; drain and discard grease. Keep warm while preparing tostada shells.

Step 4
Brush oil over both sides of tortillas and arrange on a baking sheet.

Step 5
Bake tortillas in preheated oven until crisped on top, about 5 minutes. Flip tortillas and continue baking until other side crisps, 2 to 3 minutes more.

Step 6
Heat refried beans in a saucepan over medium-low, stirring regularly until hot, about 5 minutes (see Cook's Note).

Step 7
Divide refried beans between tostadas and spread over one side of each; spoon ground beef mixture over the beans. Top each tostada with lettuce, Cheddar cheese, and diced tomato.