First, measure the dimensions of your mini fridge. Our fridge was 21.3L" x 21.3W" x 31.4H" tall. You'll want to add a couple of inches of width and depth to allow for proper ventilation per fridge instructions. We decided to make the bar 62"L x 26.5W" x 33"H.
Measure and cut five 62"L boards for the top of the bar. Use wood glue on the joints and clamp the boards into place.