Tarte Au Sucre (Brown Sugar Pie)

Name: Tarte Au Sucre (Brown Sugar Pie)
Cuisine: European, Mediterranean, French
Ingredients: Pastry for a double-crust pie; 2 cups brown sugar (light or dark) or 1 cup brown sugar and 1 cup maple sugar; 1/2 cup light cream, plus more for brushing the crust; 1/2 stick (4 tablespoons) salted butter, softened; 6 tablespoons all-purpose flour; 1 large egg; 2 teaspoons vanilla extract; Pinch of salt; Whipped cream and tart berries (such as raspberries or red currants), for serving