High fat, moderate-to-low protein foods

Oils & fats: olive oil, coconut oil, ghee, butter, lard
Olives
Avocados
Dark chocolate
Flax seed (make microwave flax bread!)
Chia seeds
Leafy salads with oily dressing
Caesar salad
Vegetables with butter
Camembert cheese, Brie cheese, blue cheese
Eggs
Walnuts, almonds, pecans
Macadamia nuts (treat like an oil, a cup of these is over 900 calories! And it is not hard to eat a cup's worth.)
Cream cheese
Heavy cream
Sour cream
Almond milk
Bacon
Braunschweiger

A good chart with nutrition info for different keto foods:

https://www.perfectketo.com/full-ketogenic-diet-food-list/