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Ingredients

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• 4 tablespoons olive oil, divided
• 1 large yellow onion, diced small
• 4 cups small-diced (about 1/2-inch pieces) vegetables (see Note)
• 5 ounces baby spinach or another green you like, roughly chopped
• Kosher salt and freshly ground black pepper
• 3 garlic cloves, finely chopped
• Red pepper flakes
• 1 teaspoon dried oregano
• 1 6-ounce can tomato paste
• 1 (28-ounce) can crushed tomatoes
• Handful chopped fresh basil (optional)
• 1 pound dried lasagna noodles (not no-boil type)
• 1 pound (2 cups) whole milk ricotta
• 1/4 cup heavy cream (optional)
• 1 pound coarsely shredded low-moisture mozzarella
• 1 cup (4 ounces) finely grated parmesan