Creamy Spinach Lasagna My NoBoil Family Favorite - EPPYC

Ingredients

• 2 tablespoons olive oil (30 ml)
• 1 medium onion, finely chopped (approx. 1 cup / 150g)
• 2 cloves garlic, minced
• 1 (28 ounce) can crushed tomatoes (794g)
• 1 (15 ounce) can tomato sauce (425g)
• 1 teaspoon dried oregano
• 1/2 teaspoon dried basil
• 1/4 teaspoon red pepper flakes (optional)
• 1/2 teaspoon salt, plus more to taste
• 1/4 teaspoon black pepper, plus more to taste
• 1 tablespoon sugar (or honey) (12g)
• 2 tablespoons unsalted butter (30g)
• 1 clove garlic, minced
• 1 (10 ounce) package frozen chopped spinach, thawed and squeezed dry (283g)
• 1/4 teaspoon salt
• 1/8 teaspoon black pepper
• 1 (15 ounce) container ricotta cheese (425g)
• 1/2 cup grated Parmesan cheese (approx. 50g)
• 1 large egg, lightly beaten
• 9 no-boil lasagna noodles
• 2 cups shredded mozzarella cheese (approx. 200g)