For an E style meal, you can have up to 1½ cups of beans total.
Rinsed ground beef crumbles have anywhere from 4 grams per 3.5 ounces (for the cheapest 30% ground beef) to 3 grams for a leaner 10% ground.
If you'd rather indulge in the melty cheese, and move to an S, then you can add your one can of beans, and serve yourself, then add the additional can before serving the family.