For even shaping, use a loaf pan as a mold to shape the meat loaf; then invert onto the baking sheet.
1 tablespoon olive oil
2 cups chopped red onion (about 1 large)
6 garlic cloves, minced
1/2 cup ketchup, divided
1 3/4 pounds 90% lean ground sirloin
1 1/2 cups fresh whole-wheat breadcrumbs
1/4 cup chopped fresh basil
1 tablespoon spicy brown mustard
1/2 teaspoon kosher salt
1/2 teaspoon freshly ground black pepper
3 ounces Parmesan cheese, grated (about 3/4 cup)
2 large eggs
How to Make It
Preheat oven to 375°.
Heat a large nonstick skillet over medium-high heat. Add oil; swirl to coat. Add onion and garlic; sauté 5 minutes. Cool slightly. Combine onion mixture, 1/4 cup ketchup, and remaining ingredients in a large bowl, stirring just until combined. Press beef mixture into a 9 x 5-inch loaf pan. Invert pan onto a foil-lined baking sheet. Remove loaf pan. Bake meat loaf at 375° for 45 minutes. Brush top with remaining 1/4 cup ketchup. Bake at 375° for 10 minutes or until a thermometer inserted into the center registers 155°. Let stand 10 minutes. Cut into 8 slices.