rhubarb coffee cake

Ingredients For rhubarb coffee cake

• 1/2 c

  butter or margarine
• 1 1/2 c

  sugar
• 2

  eggs
• 1 c

  sour cream
• 1 tsp

  vanilla
• 2 c

  all purpose flour
• 1 tsp

  baking soda
• 2 c

  finely chopped rhubarb
• TOPPING
• 1/2 c

  packed brown sugar
• 1 Tbsp

  all purpose flour
• 1 tsp

  cinnamon
• 1 Tbsp

  butter or margarine softened
• 1/2 c

  walnuts (optional)