Chosen foods has an avocado mayo that’s like 4-5 ingredients, no other oils, it’s ~9 bucks a container though. Mustard you can find relatively easily with minimal ingredients and is vastly easier to make than mayonnaise. There’s a few chip brands that are three ingredients with only avocado oil as well for decent snacks. When i did keto for a year I got pretty good at roasting my own almond/ nut flavor mixes which is an easy snack too. Hummus and baba ganoush are pretty easy to make with a food processor, toum is tricky like mayonnaise but amazing.