Heat oven to 350°F. Line 24 regular-size muffin cups with paper baking cups. In large bowl, beat flour, granulated sugar, cocoa, baking soda and salt with whisk. Add remaining cake ingredients. Beat with electric mixer on low speed 30 seconds, scraping bowl once. Beat 2 minutes on medium speed, scraping bowl occasionally. Divide batter evenly among muffin cups (cups will be full).