Wild Blueberry Muffins

Ingredients:

• 1 cup brown sugar
• ½ cup vegetable oil
• 1 egg
• 2 tsp vanilla
• 1 cup butter milk
• 2 ½ cups all purpose flour
• 1 tsp baking soda
• 1 tsp baking powder
• ½ tsp salt
• 1 ½ cups blueberries

Topping:

• 1/3 cups brown sugar
• 1 1/2 tsp cinnamon
• 1 tbsp melted butter