Grandma's Buttermilk Coffee Cake

This is the best coffeecake I've ever had! So easy to make and always a hit. Not sure if it is really grandma's recipe or if she got it somewhere.

• Ready In: 45 mins
• Serves: 12

Ingredients

• 3⁄4 cup  vegetable oil
• 2 1⁄4 cups flour (I use all purpose and it turns out fine)
• 1⁄4 teaspoon salt
• 1 1⁄2 teaspoons cinnamon
• 1  cup brown sugar
• 3⁄4 cup granulated sugar
• 1  teaspoon baking soda
• 1  teaspoon baking powder
• 1  cup buttermilk (the dry buttermilk found in the baking section of the store will work, just follow the package instr)
• 1  egg, slightly beatten
• 1⁄2 cup walnuts, chopped

Directions

1. Preheat oven to 350 degrees.
2. Mix flour, salt, and 1/2 teaspoon of cinnamon into a large mixing bowl. Add sugar and oil and mix on medium speed until well blended and feathery.
3. Remove 3/4 cup of this mixture and put in a smaller mixing bowl for the topping. Add walnuts and remainder of cinnamon to the contents of the smaller bowl for the topping, mix well and set aside for later.
4. To remaining mixture (not the topping) add baking soda, baking powder, egg and buttermilk. Mix until smooth, this is the coffeecake batter.
5. Spoon the cake batter into a buttered 9 x 13 baking dish. Sprinkle the topping over the cake batter and press lightly with fingers. Bake at 350 degrees for 25 - 30 minutes.