Slow Cooker Peach Cobbler - Alton Brown

Ingredients

• 6 ounces dark brown sugar
• 3 1/2 ounces rolled oats
• 4 ounces all-purpose flour
• 1/2 teaspoon baking powder
• 1/2 teaspoon freshly ground allspice
• 1/2 teaspoon freshly grated nutmeg
• 1/4 teaspoon kosher salt
• 4 tablespoons unsalted butter, at room temperature, plus extra for the cooker
• 20 ounces frozen peach slices