I added the half and half to compensate for the fact that I was using 93% lean ground beef (that's what I found in my freezer). If I were using ground chuck or beef with more fat, I would omit the half and half.
Calorie count is purely an estimate calculated using an online application to serve as a guide and not to be taken as accurate nutritional information. Percent Daily Values are based on a 2,000 calorie diet.