Preheat your oven to 400 degrees. Place parchment on a baking sheet and spray with non-stick cooking spray. Take the pie crust and roll it out into a 12-inch circle or oval.
Next, in a medium skillet preheated to medium-high heat add olive oil, zucchini, corn, salt and pepper. Saute the veggies until softened for about five minutes.
Add the tomato paste and water to a mixing bowl and whisk until combined. Take a spatula and spread the tomato paste on the pie crust leaving a 2-inch border. Next, top the tomato paste with zucchini, corn, grape tomatoes, Parmesan cheese, and mozzarella.
Fold the exposed border of dough toward the center. Take the egg and whisk it in a small bowl with a splash of water. Using a pastry brush, brush the egg wash all over the pie crust border. If desired, sprinkle Parmesan on top of the border.
Cook the tart for about 15 to 20 minutes or until golden brown and the cheese has melted. Serve and enjoy!