Place your bacon slices in a pan over medium heat. Cook on both sides until crispy, place on a paper towel to soak up the excess fat and cool, then dice up into small pieces that would fit well in meatballs. Duh.
Place your sweet potato in a food processor with the shredding attachment. Shred your sweet potato, remove contents, then shred it once more. You want it pretty fine.
Then shred your onion and mushrooms in the same container with the sweet potato that was shredded twice.
Add your sweet potato, mushrooms, and yellow onion to a bowl along with your breakfast sausage, maple syrup, garlic clove, diced bacon, and salt and pepper and mix well. Your hands are your best tools.