"This spin on classic lasagna isn't only easier but it ensures more perfectly crisp bites all throughout...."
INGREDIENTS
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4 tablespoons olive oil, divided
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1 clove garlic, chopped
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1 teaspoon Calabrian chili paste
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5 ounces frozen chopped spinach, thawed and squeezed dry
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1/2 teaspoon kosher salt, plus more for the pasta water
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1 cup part-skim ricotta cheese
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1 pound spicy Italian sausage, casings removed
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1 red onion, diced
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1 pound taccole pasta or lasagna pasta, broken into 2-inch pieces
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4 cups jarred marinara sauce
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2½ cups shredded low-moisture mozzarella, divided
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1½ cups freshly grated Parmesan cheese, divided