Preheat oven to 450°.
Combine first 7 ingredients in a bowl; beat at medium speed of a mixer until smooth. Beat at high speed 15 seconds; set aside.
Divide oil evenly among 8 muffin cups; coat sides of cups with cooking spray. Place muffin cups in a 450° oven for 3 minutes. Divide batter evenly among prepared cups; bake at 450° for 10 minutes. Reduce oven temperature to 350°; bake an additional 15 minutes or until golden. Serve immediately.