01 - Preheat your oven to 425°F (220°C). Line a baking sheet with parchment paper for easy cleanup.
02 - In a large mixing bowl, combine the ground turkey, breadcrumbs, Parmesan cheese, egg, minced garlic, parsley, oregano, salt, and black pepper. Blend the ingredients until just incorporated; avoid overmixing to maintain tenderness.
03 - Divide the meatball mixture into 16 equal portions and gently shape them into meatballs. Arrange the meatballs on one half of the prepared baking sheet.
04 - On the remaining half of the baking sheet, toss the sliced red bell pepper and zucchini with olive oil, salt, and pepper. Ensure the vegetables are in a single layer for even roasting.
05 - Place the baking sheet in the preheated oven and bake for 15 minutes. Carefully remove the sheet, spoon marinara sauce generously over the meatballs, and sprinkle each meatball with mozzarella cheese.
06 - Return the baking sheet to the oven for an additional 5 minutes, or until the meatballs are thoroughly cooked (reaching an internal temperature of 165°F/74°C) and the mozzarella cheese is melted and lightly golden.
07 - Divide the cooked brown rice or quinoa evenly among four meal prep containers. Top each container with a portion of the roasted vegetables and four turkey meatballs. Add extra marinara sauce as desired.
08 - Allow the assembled bowls to cool slightly before sealing the containers. Refrigerate for up to 4 days for convenient meal prepping.