Preheat oven to 400 and line a baking sheet with parchment paper.
Combine flour, powder, soda, salt, sugar and citrus zest in a large bowl. Cut in the butter
Combine egg and buttermilk. Add wet ingredients to dry ingredients, stirring just until the dough comes together. Gently stir in blueberries.
Turn onto lightly floured work surface. Knead briefly (don’t overwork) and bring the dough together in a ½” thick round. Use 2½” biscuit cutters to cut out biscuits and place them on the baking sheet.
Bake for 15 minutes or until golden brown.
While biscuits are baking, combine sugar, nutmeg and cinnamon. As soon as the biscuits come out of the oven, brush with butter and sprinkle with sugar mixture
Enjoy!!!