Doughnut Plant is the best doughnuts in the world!!!!! At least in my world. A few years ago, a past co- worker brought in some doughnuts from this store to work. He cut them up in sample sizes for us to be able to try different ones. He warn me that once I had a bite, I would fall in love. I must admit, I was a bit skeptical but I had to try. He was right. Not only did I fall in love, I became a doughnut snob. Every time I pass a dunkin doughnut, I turn my head up high and dip my eyelids low. These doughnuts is not only delicious but 
theses doughnuts are made with the highest quality all natural ingredients. No trans fats, no preservatives, no artificial flavorings, and no eggs. It's hard for me to choose a favorite one but if i didn't have a choice, I would choose the Tres Leche. 
FYI. The Doughnut Plant in Chelsea have the cutest little bathroom.