01 - Preheat oven to 375°F. Lightly grease a 12-cup muffin tin with cooking spray or oil.
02 - Cut tortillas into circles approximately 4 inches in diameter. Press each circle firmly into a muffin cup to form a shell shape. If using wonton wrappers, place one wrapper in each cup.
03 - Bake the tortilla cups for 5-6 minutes until they just start to crisp. Remove from oven but keep them in the muffin tin.
04 - While cups are baking, heat a skillet over medium heat. Add ground beef and cook, breaking it up with a spoon, until fully browned. Drain excess fat if necessary.
05 - Stir in chopped onion and garlic. Cook for 2 minutes until softened. Add taco seasoning and tomato sauce, stirring to combine. Simmer for 3 minutes until the mixture slightly thickens. Remove from heat.
06 - Spoon the beef mixture evenly into the pre-baked tortilla cups. Top each cup with shredded cheddar cheese.
07 - Return the muffin tin to the oven and bake for 7-8 minutes, or until the cheese is completely melted and the cups are golden brown.
08 - Allow the taco cups to cool in the tin for 2 minutes. Carefully remove each cup from the tin using a small spoon or knife to help release them.
09 - Top each taco cup with a dollop of sour cream, diced tomatoes, chopped cilantro, black olives, and jalapeño slices as desired. Serve immediately while warm.