Create a nutritious and protein-packed meal with beef and quinoa stuffed peppers. Using a food processor, pulse onions, garlic, and bell peppers until finely chopped. In a skillet, brown ground beef and then add the chopped pepper mixture. Cook until the beef is fully cooked and the peppers are tender. Stir in cooked quinoa, diced tomatoes, and spices like cumin and paprika. Cut the tops off bell peppers and remove the seeds. Stuff the peppers with the beef and quinoa mixture and place them in a baking dish. Bake in the oven until the peppers are tender and the filling is heated through. These stuffed peppers make a wholesome and delicious meal.