Brown the Hamburger with the onions until no longer pink.
Remove from heat and add in cheese, garlic salt, and Worcestershire sauce. Set aside.
In a bowl mix up the baking mix, milk, and eggs.
Spray a muffin tin with non-stick spray or grease with oil.
Add about 1 tablespoon of muffin mixture to each muffin tin.
Distribute evenly the meat mixture into each of the muffin tins on top of the muffin mix.
Evenly distribute the rest of the muffin mixture on top of the hamburger filling.
The muffin tins should be about 2/3 to 3/4 full.
Bake at 375 degrees for about 30 minutes or until set in the middle and golden brown.
Let sit in the muffin tin about 5 minutes then remove to serve.
We serve ours with ketchup and mustard on top.