Toss the zucchini noodles in a medium bowl with the pesto until combined.Assemble the bites: place one half mozzarella slice down on a clean surface. Then, add on a tomato slice. Then, roll up some zucchini noodles and layer on top. Finish off with another mozzarella slice. Repeat until all ingredients are used. Transfer to a serving platter and optional, drizzle with olive oil, salt, and pepper.