Instructions

Cut the cauliflower into florettes and add them to a microwave safe bowl. Add 2 tablespoons of water and cover with cling film. Microwave for 5-8 minutes, depending on your microwave, until completely cooked and tender. Drain the excess water and let sit uncovered for a minute or two. (Alternately, steam your cauliflower the conventional way. You may need to squeeze a little water out of the cauliflower after cooking.)
Add the cauliflower to a food processor and process until fluffy. Add the butter, garlic powder, and sour cream and process until it resembles the consistency of mashes potatoes. Remove the mashed cauliflower to a bowl and add most of the chives, saving some to add to the top later. Add half of the cheddar cheese and mix by hand. Season with salt and pepper.
Top the loaded cauliflower with the remaining cheese, remaining chives and bacon. Put back into the microwave to melt the cheese or place the cauliflower under the broiler for a few minutes.