→ Meats
01 - 1 ½ lbs (680 g) ground beef, 80/20 blend
→ Vegetables
02 - 3 cups fresh baby spinach, chopped (or 1 package frozen spinach, thawed and squeezed dry)
03 - 1 medium yellow onion, finely diced
04 - 2 cloves garlic, minced
→ Dairy
05 - 1 cup shredded mozzarella cheese
06 - ¼ cup grated Parmesan cheese
→ Binders
07 - 2 large eggs, lightly beaten
08 - 1 cup Italian-style breadcrumbs
→ Liquids & Condiments
09 - ¼ cup whole milk
10 - ½ cup marinara sauce, plus extra for topping
→ Spices & Seasonings
11 - 1 tsp dried Italian herb blend (basil, oregano, thyme)
12 - 1 tsp kosher salt
13 - ½ tsp freshly ground black pepper
14 - ¼ tsp crushed red pepper flakes (optional)