1. Preheat oven to 400°.
2. Weigh or lightly spoon flour into dry measuring cups; level with a knife. Combine flour and next 7 ingredients (through allspice) in a large bowl, stirring with a whisk. Make a well in center of mixture. Combine buttermilk, oil, and egg in a bowl, stirring well with a whisk. Add buttermilk mixture to flour mixture, stirring just until moist.
3. Place 12 muffin-cup liners in muffin cups, and coat liners with cooking spray. Divide batter evenly among prepared muffin cups. Bake at 400° for 15 minutes or until a wooden pick inserted in center comes out clean. Cool 5 minutes in pan on a wire rack.
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