Ingredients

  • TOPPING
  • 1/2 cup light brown sugar
  • 1/3 cup all-purpose flour
  • 2 tablespoons unsalted butter
  • 1 teaspoon cinnamon
  • MUFFINS
  • 1 1/2 cups plus 1 tablespoon all-purpose flour
  • 2 teaspoons baking powder
  • 1/4 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 large egg
  • 3/4 cup sugar
  • 1 tablespoon unsalted butter, melted
  • 1 rounded cup sour cream
  • 1 teaspoon pure vanilla extract
  • 3/4 teaspoon finely grated lemon zest
  • 1 rounded cup frozen blueberries

Method

  • MAKE THE TOPPING
  • 1. Preheat the oven to 375. In a medium bowl, combine the brown sugar, flour, butter and cinnamon. Rub with your fingers to form coarse crumbs. Refrigerate until ready to use.
  • MAKE THE MUFFINS
  • 2. Butter a 12 cup muffin pan. In a medium bowl, whisk the 1 1/2 cups of flour with the baking powder, baking soda and salt. In a large bowl, using a hand-held mixer, beat the egg at medium speed until frothy. Add the sugar and melted butter and beat until pale yellow; 1 minute. Beat in the sour cream, vanilla and lemon zest until blended. Add the dry ingredients and beat at low speed until almost blended. In a bowl, toss the blueberries with the remaining 1 tablespoon of flour. Using a rubber spatula, fold the blueberries into the batter.
  • 3. Fill the muffin cups three-fourths full of batter and sprinkle with the topping. Bake for 25 minutes or until a cake tester inserted in the center of a muffin come out clean. Remove the muffins from the pan and let cool on the rack.