Easy Peanut Butter Fudge

My partner’s mom makes peanut butter fudge on what seems like a weekly basis. I’m not sure how she can consume so much of it. She has a dedicated baking pan just for this fudge and there’s always a tub of it in the fridge.
But when I emailed her asking for the recipe, she didn’t know how to give it to me. Like most recipes of hers, she free-forms it, adding peanut butter until the batter “looks and feels” right.
It looked like I’d need to head into the kitchen and do some experimenting!