Combine first 6 ingredients in a large bowl; make a well in center of mixture.
Whisk together buttermilk and next 3 ingredients in a medium bowl. Add buttermilk mixture to flour mixture, stirring just until dry ingredients are moistened. Stir in melted butter.
Spoon batter into a lightly greased or lined 12–cup muffin pan, filling three–fourths full.
Bake at 375 degrees for 20 to 25 minutes or until a wooden pick inserted in center comes out clean.
Cool in pan for 5 minutes. Remove muffins from pan to a wire rack and drizzle with Orange Glaze.