Oatmeal Cookie Peach Cobbler

Ingredients

• 1 large egg
• 2 teaspoons vanilla extract
• ½ teaspoon baking powder
• ½ cup granulated sugar
• 1 cup all-purpose flour
• 1 tablespoon flour
• ½ cup packed brown sugar
• 6 cups sliced, peeled peaches
• ½ tablespoon lemon juice
• ½ teaspoon salt
• 2 tablespoons sugar
• ½ cup butter, softened
• 1 cup old-fashioned oats