I try to make as many things from scratch as possible (though I do so more in the summer when school is out, than when I am teaching during the school year). I recently made an adaptation of this hot cocoa mix from the Food Network, that tastes better than any mix I have bought. It's rich and delicious! Here's my version:
2 c. powdered sugar
1 c. cocoa (dutch process if possible)
1 t. salt
2 t. cornstarch
Directions: Mix all ingredients together well, and store in an airtight container. To use, heat one mug of milk until hot. Add two heaping teaspoons hot cocoa mix and stir well (I use a small wire whisk to stir). Enjoy!