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Preheat the oven to 375 degrees F.
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Add the chicken chunks to a food processor. Pulse several times until the chicken is finely ground. Scrape down the sides, add in the mushrooms, and garlic. Pulse a few more times until combined and all ingredients are finely ground.
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Scrape down the sides, add in the olive oil, breadcrumbs, salt, pepper, basil, oregano, red pepper flakes. Pulse once or twice just to combine. Drizzle a small amount of olive oil on a small baking sheet. Remove the lid and take out large pinches of the meatball mixture, roll into a ball, and then place on baking sheet.
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Bake meatballs for 10 minutes, remove and then flip meatball, return to the oven, and bake for 10-15 minutes until the internal temperature is 165 degrees F.
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While the meatballs bake, cut the bread into four pieces, and heat the marinara in a small saucepan over low heat.
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When meatballs are cooked through and golden brown on both sides, add two or three meatballs to each piece of bread, top with warm marinara and cheese, and then serve.