Use a complete, just-add-water pancake mix. It already contains dried egg and milk powder, which is what lets the recipe work with so few ingredients. If your mix calls for eggs and oil, add 1 egg to the dough.
Do not brown the sausage first. It goes in raw and renders during the bake, and pre-cooked sausage gives dry, grainy results.
Grate the cheddar from a block. Pre-shredded cheese is coated in starch and melts poorly.
Check for 160°F in the center of the largest ball rather than judging by color.
Make-ahead: roll the balls onto the lined pan, cover and refrigerate overnight, then bake with about 3 extra minutes.
Freezing: freeze raw balls until firm, bag for up to 3 months, and bake from frozen for about 30 minutes.
Nutrition values are an estimate.