1Heat oven to 400°F. Lightly spray 48 mini muffin cups with cooking spray.
2In large bowl, mix beer, pimientos, egg and onion. Stir in Bisquick mix just until blended. (Batter may be lumpy.) Stir in cheese. Spoon batter into muffin cups.
3Bake 13 to 15 minutes or until lightly browned. Remove from pan to cooling rack. Cool 10 minutes. Serve warm.