Preheat oven to 375°.
Lightly spoon flours into dry measuring cups; level with a knife. Combine flours, sugar, orange rind, baking soda, and salt in a large bowl, stirring with a whisk; make a well in center of mixture. Combine buttermilk, butter, vanilla, and egg; add to flour mixture, stirring just until moist. Fold in apricots.
Spoon batter into 12 muffin cups coated with cooking spray. Bake at 375° for 15 minutes or until muffins spring back when touched lightly in center. Remove muffins from pan, and place on a wire rack.