Preheat the oven: Start by preheating your oven to 400°F (200°C). This will ensure that the galette cooks evenly and achieves a golden-brown crust.
Prepare the baking sheet: Line a baking sheet with parchment paper to prevent sticking and make cleanup easier.
Roll out the pie crust: On a floured surface, roll out your homemade pie crust into a 14-inch circle. This will be the base of your galette, so try to keep it as evenly thick as possible.
Transfer the crust: Gently transfer the rolled-out crust to the prepared baking sheet, ensuring it remains centered.
Arrange the filling: In the center of the crust, evenly arrange the sliced Roma tomatoes, followed by the fresh mozzarella, and finally sprinkle the basil leaves. Leave a 2-3 inch border of crust exposed around the edges to fold over later.
Fold the edges: Carefully fold the edges of the crust over the filling, creating a rustic look. Don’t worry about perfection; the charm of the galette is its handmade look.
Prepare the egg mixture: In a mixing bowl, whisk together 2 large eggs, ¼ cup of heavy whipping cream, 1 tsp of kosher salt, and ¼ tsp of black pepper until well combined.
Finish the galette: Brush the crust edges with the egg mixture for a beautiful golden color while baking. Pour the remaining egg mixture gently over the filling, allowing it to seep into the layers.
Bake: Place the baking sheet in the preheated oven and bake the galette for 35-40 minutes, or until the crust is golden brown and the filling is bubbly.
Cool and serve: Remove the galette from the oven and allow it to cool for about 5 minutes. Slice into wedges and enjoy warm, relishing the incredible combination of flavors!