Preheat oven to 350 degrees. Spritz two 9 inch round or 9x13 inch casserole dishes with nonstick cooking spray.
In a large mixing bowl, stir together the cooked meat, garlic, and taco seasoning. Spread the beef mixture equally between the baking dishes.
In a separate mixing bowl, whisk together the eggs and heavy cream. Slowly pour half over each beef mixture so it sinks into the meat.
Top both casseroles with cheese.
Bake for 30 to 35 minutes or until the center is set. Allow the casserole to rest about 5 minutes before slicing.
Serve with taco toppings like black olives, salsa, jalapenos, sour cream, etc.