I've been making this for at least 40 years, on the stove top and in the microwave, I don't ever remember having a problem with it. In addition, I've recently been diagnosed with diabetes, so I redid the recipe using skim milk (2-1/2 C), egg beaters (1/4 C) and 1/4 C Splenda. It is in the fridge right now and was set up an hour ago. It's not as thick as when I use sugar and 2% milk, but it's not runny. Oh, and I did not add the Splenda until after it had boiled.