Place all of the ingredients for the pesto into a food processor and pulse until creamy. Taste and adjust, if necessary.In a large mixing bowl, add in the zucchini noodles and pour in the pesto. Toss together until fully combined.Plate the zucchini noodles into two dishes and top each with a tomato slice. Top the tomato with a slice of mozzarella and drizzle with olive oil (about 1 teaspoon) and season with salt and pepper. Garnish with red pepper flakes and basil.