My rule was to stick with simple plant foods that had no added sweeteners or flavor enhancers. So baked potatoes with salsa and black beans, quinoa bowls, vegetable chili, fresh fruit, nuts, and plain hummus. Unsweetened oat milk and plain tofu worked too since the ingredient lists were short.
No extracted oils either. I cooked with water or vegetable broth instead. Writing the standard down beforehand helped. It kept me from getting stuck on gray areas instead of the actual point, which was making room for prayer and letting God show me what controls my appetite.