Pesto Lasagna Rolls | Dinners | Umami

Ingredients

• Kosher salt and freshly ground black pepper
• 12 lasagna noodles
• 2 tablespoons unsalted butter
• 2 tablespoons all-purpose flour
• 1 1/2 cups whole milk
• 1 large egg
• 2 cups whole milk ricotta
• One 10-ounce package frozen chopped spinach, thawed and squeezed dry
• 2 1/2 cups shredded mozzarella
• 3/4 cup grated Parmesan
• 1 cup store-bought pesto
• 1 tablespoon extra-virgin olive oil
• Crushed red pepper flakes, optional