Double Cheese Meatloaf

I found this on the web years ago, but unfortunately, I don't remember where. This has a ketchup glaze, but if you reduce the amount of ketchup and increase the brown mustard (which is what I do) you can't tell. This is excellent, and really doesn't have a lot of filler. I also increase the cheese. Sometimes I make this in my muffin tins. I generally serve this with mashed potatoes and dinner rolls, and my two picky sons both like it.

• Ready In: 1 hr 15 mins
• Yields: 1 loaf

Ingredients

• 1  medium onion, chopped
• 1⁄3 cup ketchup, divided
• 2  tablespoons brown mustard, divided
• 4  ounces  shredded mozzarella cheese
• 1⁄2 cup  breadcrumbs
• 2  tablespoons  grated parmesan cheese
• 1  large egg
• 1 1⁄2 lbs ground beef

Directions

1. Preheat oven to 375°F.
2. Spray a medium skillet with cooking spray.
3. Heat over medium high heat.
4. Add onion.
5. Cook stirring occasionally, until slightly soft, about 3 minutes.
6. Mix onion, 1/4 cup ketchup, 1 Tbsp mustard, mozzarella cheese, bread crumbs, Parmesan cheese, and egg in a large bowl.
7. Add beef, mix lightly.
8. Spray a loaf pan with cooking spray.
9. Press beef mixture into pan.
10. Combine remaining ketchup and mustard in a small bowl.
11. Spread over top of meat loaf.
12. Bake meat loaf until set and cooked through, about 55 minutes.