Sour Cream Chocolate Chip Coffee Cake

Say that (the title) three times fast! This is my mom's recipe that is well loved. I made it the other day for Community Group and I didn't have the full amount of sour cream so I added applesauce in substitute. It turned out really well. Give it a try either way, but I think you'll love it with a steaming cup of coffee or hot tea!

CAKE
1/2 cup (1 stick) butter
1 1/4 cup sugar
2 cup flour
2 tsp baking powder
1 tsp baking soda
1/4 tsp salt
1 cup sour cream OR 1/2 cup sour cream & 1/2 cup apple sauce
2 beaten eggs
1 Tbsp vanilla

STREUSEL
1/2 cup chocolate chips
1/2 cup walnuts
2 Tbsp granulated sugar
2 Tbsp cinnamon

MAKE THE CAKE:
  Preheat the oven to 350 and grease a bundt pan.
  Melt butter in a small saucepan, remove from heat and add sugar. Set aside.
  In a large mixing bowl combine flour, baking powder, baking soda, salt, sour cream/applesauce, eggs & vanilla. Add butter mixture and mix everything well.

MAKE THE STREUSEL
  Combine all ingredients and mix in a small bowl.

TO ASSEMBLE
  Layer 1/3 of the cake batter into the bundt pan. Top with half of streusel mixture. Add the rest of the cake batter and then the last half of streusel. Bake for 45 min and until the knife comes out clean.