Ingredients
- 16 ounces whole-milk ricotta cheese
- 6 cups shredded mozzarella cheese (1 1/2 pounds), divided
- 1 teaspoon kosher salt
- 1/2 teaspoon freshly ground black pepper
- 2 (24-ounce) jars meat sauce (about 5 cups)
- 12 no-boil lasagna noodles
- 2 ounces baby spinach (about 2 packed cups)
- Cooking spray
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