buttery black walnut coffee cake

Ingredients For buttery black walnut coffee cake

• 1/3 c

  butter, softened
• 3/4 c

  sugar
• 2 lg

  eggs
• 1 tsp

  pure vanilla extract
• 1 1/2 c

  all purpose flour
• 3 tsp

  baking powder
• 1/2 tsp

  salt
• 1/2 c

  sour cream
• TOPPING & FILLING
• 1/4 c

  brown sugar
• 1/4 c

  white sugar
• 1/2 c

  flour
• 1 tsp

  cinnamon
• 1/4 c

  (1/2) stick butter cut into small cubes
• 1/2 c

  black walnuts