Combine cashew meal, garlic, sage, salt, and pepper together and mix well.
In a large bowl, mix the ground chicken, onions and pre-combined spices using your hands. Shape into 1.5″ balls, and place in a large sauté pan over medium heat.
Once meatballs begin to brown (about 3-4 minutes), flip each meatball using tongs.
After browned on both sides, add tomato sauce, broth, mushrooms, and tomatoes and softly shake the pan to incorporate.
Reduce heat to low, cover with lid, and allow to simmer for 10-15 minutes.