Preheat oven to 400º.

In a medium bowl, add egg, salsa, chili powder and salt, whisking with a fork to combine. Stir in oats. Fold in ground beef gently until all ingredients are evenly incorporated into the beef.

Coat a muffin tin with nonstick spray. Divide ground beef mixture among 9 of the muffin tins, pressing the beef down slightly in the center.

Bake for 15 minutes, then remove and add a teaspoon of salsa to the center of each meatloaf, and top each with at tablespoon of cheddar cheese. Put meatloaves back into the oven for another 5 minutes, or until fully cooked.

Remove from oven and let cool 2-3 minutes, then remove mini meatloaves from muffin tin and serve!