Ingredients
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1 tablespoon extra-virgin olive oil
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1 cup chopped yellow onion
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2 large cloves garlic, finely chopped
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3 (10 ounce) packages frozen mixed vegetables (such as green beans, carrots, zucchini and yellow squash)
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¼ cup chopped fresh basil, plus more for garnish
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3 tablespoons unsalted butter
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6 tablespoons all-purpose flour
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3 ½ cups whole milk
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½ cup grated Parmesan cheese
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¼ teaspoon salt
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1 (9 ounce) package no-boil lasagna noodles
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2 (12 ounce) packages frozen butternut squash puree, thawed
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4 cups shredded Italian cheese blend
Directions
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Preheat oven to 375°F. Lightly coat a 9-by-13-inch baking dish with cooking spray.
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Heat oil in a medium skillet over medium-high heat. Add onion and cook, stirring often, until just tender, about 5 minutes. Add garlic and cook, stirring often, for 1 minute. Transfer the onion and garlic to a large bowl; stir in frozen vegetables and basil.
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Melt butter in the skillet over medium-high heat. Add flour and whisk to combine. Cook, whisking, for 30 seconds. Gradually add milk; cook, whisking constantly, until the mixture thickens, 2 to 3 minutes. Add Parmesan and salt; whisk until smooth. Remove from heat.
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Spread 1/2 cup of the cheese sauce on the bottom of the prepared baking dish. Layer on 3 lasagna noodles, evenly spacing the noodles crosswise in the dish. (The noodles will not cover the bottom of the dish but will expand when baking.) Top the noodles evenly with 3 cups vegetable mixture, 3/4 cup cheese sauce and 3/4 cup shredded cheese. Layer 3 lasagna noodles over the cheese; spread half the squash over the noodles and sprinkle with 3/4 cup cheese. Repeat the layers once, starting with noodles and ending with squash. Sprinkle with 3/4 cup cheese. Layer with the remaining 3 lasagna noodles; spread the remaining cheese sauce over the noodles and sprinkle with the remaining cheese.
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Lightly coat a sheet of foil with cooking spray; cover the baking dish coated-side down. Bake for 30 minutes. Uncover and bake until golden brown and bubbly, about 15 minutes more. Let stand for 15 minutes before serving. Sprinkle with basil, if desired.
