Preheat the oven to 375 degrees and lightly grease a muffin tin.
In a large bowl, combine the ground beef, diced pepperoni, 1/2 cup mozzarella, marinara sauce, egg, almond flour, Italian seasoning, garlic powder, salt, and pepper.
Divide the mixture evenly among 8 muffin cups and press down gently to shape.
Sprinkle the remaining 1/4 cup mozzarella over the tops of the meatloaves.
Bake for 20 to 25 minutes until the internal temperature reaches 160 degrees.
While the meatloaves bake, place the chopped romaine in a serving bowl and set aside.
Remove the meatloaves from the oven and let them rest for 5 minutes.
Toss the romaine with the Caesar dressing and Parmesan just before serving.