Easy Vegetarian Red Beans Lasagna Recipe

Ingredients

• 1 tablespoon olive oil
• 1 small onion, chopped
• 1 clove garlic, minced
• 1 (15 ounce) can red beans, drained
• 1 (14.5 ounce) can diced tomatoes, drained
• 0.5 red bell pepper, chopped
• 1 teaspoon dried basil
• 1 teaspoon dried oregano
• salt and pepper to taste
• 3 tablespoons butter
• 3 tablespoons all-purpose flour
• 1.5 cups cold milk
• 0.5 cup grated Parmesan cheese
• 4 no-boil lasagna noodles
• 4 ounces shredded Gruyere cheese