Rhubarb Streusel Muffins - Master recipes

Ingredients

• 1/2 cup butter, softened -
• 1 cup packed brown sugar -
• 1/2 cup sugar -
• 1 large egg, room temperature -
• 2 cups all-purpose flour -
• 1 teaspoon baking powder -
• 1/2 teaspoon baking soda -
• 1/8 teaspoon salt -
• 1 cup sour cream -
• 3 cups chopped fresh or frozen rhubarb, thawed -
• Topping: -
• 1/2 cup chopped pecans -
• 1/4 cup packed brown sugar -
• 1 teaspoon ground cinnamon -
• 1 tablespoon cold butter -