
Heat oven to 350°F. Brown beef 7-8 minutes, drain, then season with chili powder, cumin, garlic powder, salt and a splash of water.
Warm the refried beans in a small pot or the microwave, stirring in a spoonful of water to loosen.
Lay tostada shells on a sheet pan and warm them 3-4 minutes so they get extra crisp.
Spread each shell with beans, then top with beef, lettuce, diced tomato, cotija and sour cream.
Add hot sauce at the table. Tip: eat them over a plate—they're meant to crunch and crumble.
Photo: DinnerDrop