cinnamon sugar apple cake

Ingredients

• 1-1/2 cup light brown sugar
• 1/3 cup vegetable oil
• 1 - egg
• 1 cup buttermilk (can substitute w/1 tbs. white vinegar or lemon juice plus milk to equal 1 cup--let stand for 5-10 minutes)
• 1 teaspoon baking soda
• 1 teaspoon pure vanilla extract
• 2-1/2 cup all-purpose flour
• 1-1/2 cup apples, chopped
• 1/2 cup granulated sugar
• 1 teaspoon cinnamon, ground
• 1 tablespoon butter