Preheat oven to 350 degrees F. Coat an 8x8x4-inch baking dish with nonstick spray.
Cook beef and onion in a large skillet over medium-high heat; breaking it up into small crumbles, until no pink remains, about 3 minutes. Season with a sprinkle of salt and pepper, add in the garlic, stir to incorporate. Pour off all the grease.
Return to heat and stir in the beans, taco sauce, tomatoes, jalapeños, and olives until combined.
Spread a thin layer of the mixture into the bottom of the prepared baking dish. Cover with 2 tortillas, splitting one of them in half to fit. Spread more of the meat mixture on top, followed by 1/3 cup cheese. Repeat these layers 3 more times, ending with meat mixture and cheese.
Transfer to the oven and bake until cheese is bubbly and golden, about 25 minutes.
Let rest for 10 minutes before slicing, which will help the layers stay intact.
Serve with your choice of toppings and enjoy!
Notes
Swap out the ground beef. Ground turkey or cooked shredded chicken also work great.Try different beans. Instead of refried beans, use black or pinto beans.Use a different cheese. Replace the Mexican cheese blend with Pepper Jack to make it more spicy.Replace the corn tortillas. Flour tortillas can be substituted for the corn tortillas, if you prefer, or even crushed up Doritos!Storage. Make ahead, storage, and freezer instruction is included in the article.
Nutritional information given is an automatic calculation and can vary based on the exact products you use and any changes you make to the recipe. If these numbers are very important to you, I would recommend calculating them yourself.