Step 1

Preheat the oven to 375°F. Spray a 13x9-inch baking dish with nonstick spray.

Step 2

Heat a large Dutch oven over medium-high heat. Coat the pan with cooking spray. Add the onion to the pan; sauté 4 minutes or until lightly browned. Add the garlic; sauté 1 minute. Spoon the onion mixture into a large bowl.

Step 3

Heat 1 teaspoon of the oil in a pan over medium-high heat. Add the zucchini and yellow squash; sauté 4 minutes or until tender and just beginning to brown. Add to the onion mixture.

Step 4

Heat the remaining 1 teaspoon of oil in a pan over medium-high heat. Add the sliced carrot; sauté 4 minutes or until tender. Add the chopped broccoli; sauté 4 minutes or until crisp-tender. Add to the onion mixture. Sprinkle with ½ teaspoon salt; toss well to combine.

Step 5

Place the flour in a medium saucepan. Gradually add the milk, stirring with a whisk until blended. Bring to a boil over medium heat; cook 2 minutes or until thick, stirring constantly. Remove from heat. Add the Parmesan, salt, pepper, and nutmeg; stir until smooth. Stir in the spinach.

Step 6

Combine the cottage cheese and 1½ cups mozzarella; stir well. Spread ½ cup of the sauce mixture in the bottom of the prepared baking dish. Arrange 3 noodles over the sauce mixture in the dish; top with half of the cottage cheese mixture, then half of vegetable mixture, and about 1 cup of the sauce mixture. Repeat layers, ending with noodles. Spread the remaining sauce mixture on top of the noodles; sprinkle with ½ cup Parmesan and remaining ½ cup mozzarella.

Step 7

Cover and bake for 20 minutes. Uncover and bake an additional 20 minutes or until the cheese is bubbly and beginning to brown. Let stand 10 minutes before serving.