Easy Cheesy Carrots / 2 medium carrots (about 8 1/2 ounces), peeled, coarsely chopped, 8 ounces cauliflower florets, 5 tablespoons vegetable oil, divided, 3/4 teaspoon kosher salt, divided, 1/2 cup shredded parmesan (about 1 ounce), 1/2 cup shredded sharp cheddar (about 1 ounce), 1 garlic clove.