Step #2 Lightly spoon flour into dry measuring c; level with a knife.
Step #3 Combine flour & next 5 ingredients (flour through nutmeg) in a medium bowl; cut in butter with a pastry mixer or 2 knives until mixture resembles coarse meal.
Step #4 Combine buttermilk, egg, & rind; stir well with a whisk.
Step #5 Add to flour mixture; stir just until moist.
Step #6 Gently fold in blueberries.
Step #7 Spoon batter into 12 muffin c coated with cooking spray.
Step #8 Bake at 400° for 20 mins or until the muffins spring back when lightly touched.
Step #9 Remove muffins from pans as soon as possible, & place on a wire rack to cool.
Step #10 Combine lemon juice & powdered sugar in a small bowl.
Step #11 Drizzle glaze evenly over cooled muffins.
Step #12 Note: You can make these muffins up to 2 days ahead & glaze them the morning of the brunch.