Lasagna Primavera

This meal is one you can make ahead of time and freeze to use on a night you just don't feel like cooking! I feel like that is the mode I am in right now. Hope you enjoy it!

• 1/4 cup olive oil, plus more for foil
• 1/2 cup all-purpose flour
• 2 garlic cloves, minced
• 6 cups whole milk
• 2 packages (10 ounces each) frozen chopped spinach, thawed and squeezed dry
• 1 package (10 ounces) frozen peas
• 1/2 pound carrots (4 to 5), halved lengthwise and thinly sliced
• Coarse salt and ground pepper
• 1 container (15 ounces) part-skim ricotta (about 2 cups)
• 1 large egg
• 1 package (9 ounces) no-boil lasagna noodles (12 to 16 noodles)
• 1 pound part-skim mozzarella, shredded
• 1 cup grated Parmesan

1. Preheat oven to 400 degrees. In a large saucepan, heat oil over medium; add flour and garlic. Cook, stirring constantly, 2 to 3 minutes (do not let flour mixture darken); whisk in milk. Bring to a boil; reduce to a simmer, and cook, whisking occasionally, until thickened, 3 to 5 minutes. Add spinach, peas, and carrots; season with salt and pepper. Set sauce aside.
2. In a medium bowl, combine ricotta, egg, 1/2 teaspoon salt, and teaspoon pepper.
3. In the bottom of a 9-by-13-inch baking dish, spread a thin layer of vegetable sauce. Layer noodles, half the remaining vegetable sauce, another noodles, half the ricotta mixture, half the mozzarella, and half the Parmesan; repeat.
4. Cover dish with lightly oiled aluminum foil, and place on a large rimmed baking sheet. Bake 45 minutes, uncover, and bake until bubbling and browned, about 20 minutes more. Let cool 10 to 15 minutes before serving.