If your brain requires garbage when stressed then make sure you have at least KETO garbage to feed it. You can have keto pancakes, waffles, cookies, ice cream, brownies etc. If you’re going to eat junk, eat junk that will hold you where you are, not cause a very difficult to fix backslide. You can obviously still accomplish that and gain fat on keto, but with keto junk food it won’t be half as bad as doing it with sugary ones.
One of my go to’s that I eat DAILY to keep my protein up is a protein “sludge”. Take a scoop or two of protein powder, mix in just enough water or almond milk to make it mud, throw in about 50g frozen blueberries and BOOM! Tastes like a desert/moose/icecream. I’ve always got a couple different flavors on deck, Usually always chocolate but right now also Oatmeal Cookie and Blueberry Muffin (that one goes awesome with the blueberries. My wife does a cheesecake one with strawberries. It’ll fill you up and tell your brain your eating desert. Mostly protein, pretty low carb.