Preheat oven to 400°.
Combine flour, baking powder, soda, salt, sugar and orange rind in a bowl.
Cut in shortening with a pastry blender or fork until crumbly.
Combine egg and buttermilk, add to flour mixture, stirring just until dry ingredients are moistened.
Stir in blueberries.
Place dough on a lightly floured board and knead 4 times. Divide dough into 4 sections. Cut each section into 4 pieces.
Gently form into circles. Place on a silicone mat on a cookie sheet and bake at 400° for 15 minutes.
Combine butter, sugar, cinnamon, and nutmeg. Brush on warm biscuits.