1/2 cup unbleached all-purpose flour
1/2 cup (packed) brown sugar
1 teaspoon ground cinnamon
4 tablespoons butter (at room temperature, cut into 8 pieces)
1/2 cup chopped pecans or walnuts
1 cup Sugar
1/2 cup unsalted butter (at room temperature)
3 large egg yolks
1 teaspoon vanilla extract
  grated zest of 1 lemon
1 cup sour cream
1 1/2 cups all-purpose flour
1 teaspoon baking soda
1 teaspoon baking powder
1/2 teaspoon salt
1 cup Earthbound Farm Frozen Organic Blueberries (still frozen)