Preheat oven to 375 degrees. Spray 12 muffin pan cups with baking spray.
In 10 inch skillet, cook ground beef and onion over medium-high heat stirring frequently (5-7 minutes). Drain when done, cool 5 minutes; stir in Worcestershire sauce, garlic salt and cheese.
Stir baking mix ingredients in medium bowl with whisk. Spoon in one scoop of mix into each muffin cup. Top with 1/4 cup burger mix. Spoon 1 tablespoon of baking mix onto burger mix in each cup.
Bake for 30 minutes or until toothpick comes out clean and muffin tops are golden. Cool 5 minutes. With knife, loosen sides of muffins from pan, remove from pan and place top side up on cooling rack. Cool 10 minutes, serve with garnishes.