I did a search for you and came up with this recipe. I had bought the Coffee Cake from the Q and it came to me all broken and just fell completely apart. It was very good, but could not serve to company. Anyway:
Grandma Glady's Coffee Cake Recipe (Makes 1 12-inch cake)
For the Cake Batter
1/2 cup butter or margerine (I prefer butter)
1 cup of sugar
2 cups all purpose flour, sifted
1 tsp baking powder (I use double acting)
1 tsp baking soda
1/4 tsp salt
2 eggs
1 cup sour cream (use regular, not light)
1 tsp vanilla
For the Streusel Toppings and Fillings
1/2 cup of brown sugar, packed
1/2-1 cup of chopped walnut (I used close to 1 1/4 cup cos I love walnut)
1 tsp cinnamon powder
Directions
1. Combine flour, baking powder, baking soda and salt in a bowl. Set aside. Preheat oven at 350F. Grease and flour a 10 cups tube pan (about 12-inch).
2. In your stand mixer or a bowl, cream butter and sugar till light and fluffy. Beat in eggs and vanilla till well combined.
3. Add in flour, alternate with sour cream and mix till batter is well combined. (Batter will come out really thick)
4. In a bowl, combine brown sugar, walnuts, and cinnamon. Mix well.
5. Scoop half the cake batter into tube pan. Spread till you get an even layer.
6. Sprinkle half the streusel mix evenly onto the cake batter.
7. Top with remaining cake batter. Spread to get an even layer, enough to cover the streusel filling.
8. Top cake with remaining streusel. Sprinkle to get an even layer.
9. Bake for 40 to 45 mins. ( I usually set the timer at 40 minutes and check. It should be done by then.)
10. Rest cake for 20 minutes before removing from pan. Slice only when cake has cooled completely as it will crumble and fall apart if you give into temptation to slice the cake when it was still warm.