Heat the oven to 375°F. Grease 8 cups of a standard muffin tin.
In a large bowl, combine the ground beef, egg, breadcrumbs, 1/4 cup of the mozzarella, 1/4 cup of the pizza sauce, Italian seasoning, garlic powder, and salt. Mix gently until combined.
Divide the mixture among the 8 prepared muffin cups. Press it in lightly, leaving the tops slightly rounded.
Spoon the remaining 1/4 cup pizza sauce over the muffins. Bake until cooked through, about 20 to 25 minutes. Sprinkle the remaining 1/4 cup mozzarella over the tops and bake for 2 to 3 minutes more, until melted.
While the muffins bake, cook the pasta according to the package directions. Drain it, then toss with a spoonful of pizza sauce from the ingredient amount already used for the muffins, if any remains on the plate. Serve the pasta alongside the meatloaf muffins.