Pre-heat oven to 400 deg.
In a large skillet over medium-high heat, sauté garlic in the ghee or coconut oil for 1-2 minutes, just letting it sweat into the fat.
Add onions and mushrooms and cook until lightly browned and all that excess water has evaporated. Set aside to cool (if it's cold outside, I'll place it outside to cool off faster).
In a large mixing bow, mix together the meat, cooked/cooled vegetables, and remaining ingredients until thoroughly blended together.
Grease 2 large baking sheets (ours are stainless steel) with ghee or coconut oil.
Using a 1" melon baller, or just a regular spoon and/or your hands if you don't have one, form 24 meatballs, placing them at least 1" apart. They should use up two baking sheets.
Bake for 15 minutes, or until cooked through.
For a one pan recipe with sauce, cook meatballs for 10 minutes, pour sauce around the pan, then finish cooking until done. This will heat the sauce, condense it some, and de-glaze your pan.
Serve with whatever side floats your boat.