Heat oven to 375°F. Bake biscuits as directed on bag; place on cooling rack. Cool 5 minutes. Set oven control to broil.
Carefully split each biscuit; place on cookie sheet. Brush cut sides with dressing; sprinkle with cheese. Broil with tops 4 to 6 inches from heat 1 to 3 minutes or until cheese is melted.
In small bowl, mash avocado to desired consistency. Spoon avocado over cheese; top with tomato slices, pressing down slightly. Sprinkle with bacon bits.