Oatmeal Spice Cake - Tiers of Joy

Ingredients

• 1 cup rolled oats
• 1 cup Dr. Pepper
• 1 stick room temperature unsalted butter
• 1 cup dark brown sugar
• 2 l room temperature eggs
• ½ tsp all purpose flour
• 1 tsp baking soda
• ¼ tsp teaspoon salt
• ⅛ tsp allspice