Tostada Casserole

This tostada casserole is a microwave-friendly Mexican weeknight dinner that layers seasoned ground beef, green chilies, melted Monterey Jack, and crushed taco shells into a bubbling, cheesy dish in under 45 minutes. No oven preheating required.

The ground beef cooks right in the microwave with grated onion, then gets mixed with tomato sauce, chili powder, and canned green chilies for a saucy, spiced filling. Shredded cheese melts into the hot meat mixture before layering, so every scoop has cheese woven through it instead of just sitting on top.

Crushed taco shells take the place of tortillas in this casserole. Three-quarters of the broken shells go on the bottom as a crunchy base, and the rest get sprinkled on top after cooking so they stay crisp instead of going soggy.

The five-minute covered rest at the end is where the flavors settle and the casserole firms up enough to scoop cleanly.

Kitchen Tips

• Break the taco shells into large, irregular pieces, not fine crumbs. You want some crunch left even under the meat layer.
• Skim the fat from the cooked beef before adding the sauce. Microwave-browned beef releases more grease than stovetop because it doesn’t sear.
• Stir the meat mixture every 2 minutes during cooking. Microwaves heat unevenly and stirring prevents hot spots.
• Top with shredded lettuce, diced tomato, sour cream, or salsa at the table for a full tostada experience.

Variations

• Oven version: Bake at 350°F (180°C) for 25 minutes instead of microwaving for a more traditional casserole with browned edges.
• Turkey swap: Use ground turkey instead of beef for a leaner version. Add an extra teaspoon of chili powder to compensate for the milder flavor.
• Black bean boost: Stir in a drained can of black beans with the meat mixture for extra protein and fiber.