Sour Cream Maple-Walnut Muffins - Master recipes

Ingredients

• 1 1/2 c. all-purpose flour -
• 1 1/2 tsp. baking powder -
• 1/4 tsp. baking soda -
• 1/4 tsp. salt -
• 5 tbsp. unsalted butter -
• 1/4 c. plus1 tsp. granulated sugar -
• 1/4 c. firmly packed light brown sugar -
• 1 large egg -
• 6 tbsp. sour cream -
• 6 tbsp. Vermont maple syrup -
• 2 tbsp. finely chopped walnuts -
• tsp. ground cinnamon -