Preheat oven to 425 degrees. Take the pizza dough out of the fridge and allow to come to room temperature. Liberally grease a foil-lined baking sheet. Stretch out the dough on the baking sheet with your hands, working from the center towards the outer edges, until you have formed a rough 1/4-inch thick rectangle. Poke the dough with a fork and season with salt. Bake for about 15 minutes, until dough is barely golden brown. HINT: Use a rolling pin or wine bottle on a lightly floured surface to help you roll out the dough!

Meanwhile, halve both the zucchini and squash lenghtwise, then slice into 1/4-inch half moons. Coarsely chop parlsey leaves. Zest and halve the lemon.

In a medium pan, heat 1/2 teaspoon olive oil over medium heat. Add the squash, zucchini and a squeeze of lemon and cook, tossing, for about 4-5 minutes, until softened. Season with salt and pepper and set aside.

When crust is barely golden brown, remove from the oven and spread with 1/4 cup pesto. Then, top with mozzarella, squash and zucchini, and a sprinkle of lemon zest, salt and pepper. Drizzle flatbread with 1/2 tablespoon olive oil and transfer to the oven to bake for another 7-10 minutes, until bubbly.

Sprinkle flatbread with parsley. Slice into rectangles and dig in!