Mix cornstarch and 1/3 cup sugar. Toss with berries.
Lay pie dough out on a silpat or parchment paper lined baking sheet.
Place berries in center leaving a 1 inch border all around. Dot berries with small pieces of butter.
Fold edges in making pleats every few inches, encircling the berry filling.
Brush crust edge with beaten egg and sprinkle with reserved sugar.
Bake at 425 for 20-25 minutes. Slice into wedges to serve. Top with ice cream if desired
Keyword 4th of July, berry galette, blueberries, blueberry pie, fresh berry crostada, Memorial Day, red white and blue dessert, strawberries, summer dessert