Vegetable Lasagna

Name: Vegetable Lasagna
Cook time: 4 h
Total time: 4 h
Cuisine: Italian
Ingredients: 2 TBSP olive oil; 3 medium carrots, diced; 1 yellow onion, diced; 1 large bell pepper, diced; 2 1/2 pounds roma tomatoes, chopped; 3 medium garlic cloves, minced; 2 tsp dried oregano; 1/4 tsp crushed red pepper flakes; salt & freshly ground black pepper; 15 ounces whole milk ricotta cheese; 1/2 cup freshly grated Parmesan cheese; 1 large egg; 1 tsp dried basil; 12 to 15 uncooked lasagna noodles; 12 ounces mozzarella cheese, shredded