In a small bowl, combine brown sugar and butter until blended. Spoon into 24 greased muffin cups. Drain pineapple, reserving the juice; spoon pineapple into prepared cups. Place a cherry half cut side down in the center of each.
In a large bowl, combine the cake mix, eggs, oil and reserved pineapple juice. Beat on low speed for 30 seconds. Beat on medium for 2 minutes. Spoon over pineapple, filling each cup three-fourths full.
Bake at 350° for 18-22 minutes or until a toothpick inserted in the center comes out clean. Immediately invert onto wire racks to cool.