Sauté the onions, crushed red pepper, and minced garlic in a pan with olive oil over medium heat until the onions are translucent, about 3 to 5 minutes. Season with salt and pepper. Set the mixture aside in a small bowl to cool.
Preheat your oven to 350 degrees F.
Once the onion mixture has cooled to the touch, place the onion mixture and the remaining meatloaf ingredients except for the mozzarella cheese in a large bowl.
With your hands, mix thoroughly to combine but be careful not to over mix.
Form the meatloaf mixture into a football shape by hand on a baking pan lined with aluminum foil. You can also cook it in a meatloaf pan if you desire.
Remove the meatloaf and let rest for 5 minutes. Set your oven to broil.
Slice the meatloaf and place on a baking pan lined with aluminum foil. Top with a large spoonful of marinara sauce and a handful of mozzarella.
Broil on the top rack until the cheese is melted while being careful not to burn the cheese.
Top with fresh herbs, grated parmesan, and serve on top of your favorite pasta, by itself, between some slices of toasted garlic bread, whatever you crave!