In a large bowl, combine the flour, baking powder and salt. In a large bowl, cream butter and sugar. Add eggs, milk and vanilla; mix well. Stir in dry ingredients just until moistened. Fold in frozen blueberries.
Fill greased or paper-lined muffin cups two-thirds full. Combine sugar and nutmeg; sprinkle over muffins. Bake at 375° for 20-25 minutes or until a toothpick comes out clean. Cool in pan for 10 minutes before removing to a wire rack. Yield: about 2 dozen.
Note: If using frozen blueberries, use without thawing to avoid discoloring the batter.
* When I made these the batter was VERY thick.I found it easier to use a ice cream scoop to fill muffin cups.