Preheat oven to 350 degrees. Combine peaches and blueberries in a bowl. Whisk together 1/4 cup sugar, cinnamon, and cornstarch. Add to fruit; toss to combine. Set aside. Combine egg, 2 tablespoons melted butter, and cream in a bowl; whisk with a fork. Set aside.
Sift together flour, salt, baking powder, and remaining tablespoon sugar. Make a well in center of dry ingredients, and pour egg mixture into well. Using hands, slowly draw dry ingredients into wet ingredients, and work dough until just mixed together.
Divide fruit mixture among four 8-ounce ramekins. Gently pat dough into 4 disks just big enough to fit on top of ramekins. After placing, brush dough with remaining melted butter. Place ramekins on a baking sheet. Bake until juices bubble up and crust is golden brown, 15 to 17 minutes. Serve hot, with ice cream if desired.