1Let cookie dough stand at room temperature 10 minutes to soften. Meanwhile, heat oven to 350°F. Line 2 cookie sheets with cooking parchment paper. In small bowl, mix 1/4 cup of the flour, sugar and butter with fork until crumbly; set aside to use for topping. In another small bowl, mix remaining 1 cup flour, baking powder and baking soda; set aside.
2In medium bowl, beat dough and cream cheese with electric mixer on medium speed until blended. On low speed, beat in egg, milk, lemon peel and lemon juice until well blended. Stir in flour mixture just until combined (do not overmix; mixture will be a thick batter). Carefully fold in blueberries. (If using thawed berries, rinse and pat dry with paper towel before adding.)
3Drop batter by heaping tablespoonfuls 1 to 2 inches apart onto cookie sheets, using rubber spatula to scrape batter from tablespoon. Bake 3 minutes; remove from oven. Sprinkle each muffin top with about 1 teaspoon crumb topping; immediately return to oven.
4Bake 16 to 20 minutes longer or just until edges begin to brown. Cool on cookie sheets 2 to 3 minutes before removing to cooling racks. Serve warm or cool.