This Honey Bun Coffee Cake recipe takes a box of yellow cake mix and adds a couple extra ingredients to turn it into a delicious breakfast or dessert treat.
Mix cake mix, eggs, oil and buttermilk together in a large bowl; set aside.
In a small bowl, combine brown sugar and cinnamon.
Grease and flour a 9x13-inch cake pan; pour half the cake batter in pan.
Top batter with half of cinnamon/sugar mixture, followed by remaining cake batter and ending with remaining cinnamon/sugar mixture.
Take a butter knife and swirl sugar mixture into the cake batter.
Bake at 350 degrees F for 35 to 40 minutes or until a toothpick comes out clean.