Spicy Sausage Lasagna Recipe | Food Network Kitchen | Food Network

Ingredients

• 2 tablespoons unsalted butter, plus more for buttering the dish
• 1/4 cup all-purpose flour
• 4 cups milk
• 3 garlic cloves, smashed
• Pinch freshly grated nutmeg
• Kosher salt
• 12 lasagna noodles
• 2 tablespoons extra-virgin olive oil
• 12 ounces hot Italian sausage, casings removed
• One 10-ounce box frozen spinach, thawed and squeezed dry
• 1/4 teaspoon crushed red pepper flakes
• 1 cup lightly packed fresh basil leaves, torn plus more for garnish (optional)
• 1 cup shredded mozzarella
• 1/4 cup freshly grated Parmesan
• 3 cups prepared marinara sauce