Preheat the oven to 375 degrees and line a small loaf pan with parchment.
In a mixing bowl, combine the ground beef, breadcrumbs, 1/4 cup Parmesan, egg, Italian herb seasoning, garlic, salt, and pepper. Mix until evenly blended.
Press the mixture into the prepared loaf pan and bake for 45 minutes until the internal temperature reaches 160 degrees. Let the meatloaf rest 10 minutes before slicing.
While the meatloaf bakes, spiralize the zucchini into noodles.
Heat a large skillet over medium heat and add the zucchini noodles. Cook for 2 to 3 minutes until just tender, then remove from heat.
Slice the rested meatloaf into four portions. Top each slice with a spoonful of marinara sauce and a sprinkle of additional Parmesan.
Divide the zucchini noodles among four plates and place one meatloaf slice on each portion.