Blackberry-Peach Cobbler

Ingredients

• 4 large or 6 medium peaches; 2 cans; or 2 cups frozen
• 2 cups fresh or frozen blackberries
• 1/2 cup brown sugar
• 1/4 cup flour
• 1/2 teaspoon ground ginger
• 1 tablespoon Grand Marnier
• butter for greasing
• 1-1/2 cup flour
• 1/2 cup quick oats
• 1 tablespoon baking powder
• 1/2 teaspoon cinnamon
• 1/3 cup sugar
• 1 egg slightly beaten
• 1/3 cup milk
• 1/3 cup melted butter
• cinnamon sugar for sprinkling