New M&M Birthday Cake Taste Test. Looking for something sweet? How about some birthday cake in the form of M&M's? So M&M's just came out with a new flavor in a mega size, and of course Jenny and I had to try it out for ourselves. So first the basic, calories are around 210 for about 1/4 cup and the coloring for these little babies are yellow, red and blue. A fun confetti like theme. Check out the full video to see our exact tasting of the little M&M's.