You can use low fat or full fat cottage cheese. I would not recommend fat free cottage cheese. Don’t worry if you see the cottage cheese lumps prior to cooking, they will melt into the batter when cooking, making the muffins nice and light. If you are out of thyme you can substitute dried basil or parsley. The cheese can be changed as well, use a pepper jack for more spice or mozzarella for a milder flavor. You can also sprinkle some cheese on top of the muffins the last two minutes in the oven.