rhubarb streusel muffins

Ingredients For rhubarb streusel muffins

• 1/2 c

  butter, softened
• 1 c

  packed brown sugar
• 1/2 c

  sugar
• 1

  egg
• 2 c

  all purpose flour
• 1 tsp

  baking powder
• 1/2 tsp

  baking soda
• 1/8 tsp

  salt (optional)
• 1 c

  sour cream
• 2 1/2 c

  fresh rhubarb (or frozen thawed)
• TOPPING
• 1/2 c

  chopped pecans
• 1/4 c

  packed brown sugar
• 1 tsp

  ground cinnamon
• 1 Tbsp

  cold butter