Staple Healthy Foods

Raw nuts, eggs, cooked chicken strips, avocados, green chili, feta and goat cheese, simply protein bars, cashew milk, dark chocolate, jerky, almond butter, zucchini, tomatoes and coconut oil.

Greek yogurt, oatmeal, walnuts, natural peanut butter, dark chocolate, chicken breasts, low sodium, fat free chicken broth. Now that the farmers market in my area is back, I go there for fruits and vegetables.

One?
This stuff is all year. Other produce is mostly seasonal
Grains

• grits/polenta
• whole wheat flour
• whole grain cornmeal
• masa harina
• steel cut oats

Produce

• onions
• garlic
• celery
• carrots
• peppers
• canned tomatoes
• dried tomatoes
• raisins
• frozen WILD blueberries

Dairy

• milk, 2%
• yogurt, low fat
• eggs
• parmesan
• cheddar

Meat

• ground chuck
• chicken thighs
• pork chops
• ham hocks
• sausage; andouille, Italian, chorizo
• canned tuna

Vinegar

• red wine
• white wine
• balsamic
• apple cider
• white distilled

Other

• extra virgin olive oil
• peanut oil
• peanut butter
• fruit preserves

Edit forgot beans & rice
Rice, brown long grain, basmati
Dried beans

• pintos
• kidney beans
• black beans
• black-eyed peas
• chickpeas
• navy
• butter (large limas)
• split peas

There are some other similar threads that have existed on this topic that might be worth seeking out (too bad it can be hard to find threads sometimes). Mine:

Seasoning-type stuff

Olive oil
Coconut oil
vinegars
various herbs and spices
pepper sauces/sriracha
soy sauce
fish sauce
lemons and/or limes
mustards (I have lots)

Pantry staples

whole wheat pasta
steel cut oats
dried lentils
other dried beans or the like (chickpeas, split peas, etc.)
rice or quinoa or barley
canned tomatoes
nuts of various sorts
Quest bars
protein powder
sardines
herring

Perishables-always there

Eggs
cottage cheese (lowfat, usually)
Fage 2% or 0% plain greek yogurt
smoked salmon
feta cheese
some other sort of cheese
butter (sometimes)
potatoes/sweet potatoes (or if in season only, corn)
olives
tofu

Perishables--depends on season, constantly alternating

whatever fruit is in season (in winter I tend to eat blueberries, applies, and bananas the most)
whatever veggies are in season (if it's winter I tend to do a lot of broccoli, spinach and other greens, cauliflower, brussels, zucchini and squash, as those are reasonably reliable, but I try to get as much of a variety as possible)
fish/shellfish
meat (I tend to get this from a local farm based on what they have/what sounds good), keep it in the freezer, and take it out based on what I plan to use that week and defrosting time

Extras

I usually have a couple kinds of ice cream in my freezer
Coffee-whole beans
Various kinds of tea

I'm sure there's more, but these are what come to mind and probably the vast majority of what's in my house at any time. I tend not to have flour or sugar or other baking staples on hand since I just don't bake much anymore. I'll buy it specially if I need it.

Boiled eggs
Apples
Almonds
Granola
Salmon
Avocado
Green beans
Black beans
COFFEE:)

One food? I can't even think which one food I'd choose. We usually have enough food that we could be stuck at home for months and still eat well. We are never without a variety of whole grains, vegetables and fruit (fresh, frozen and canned), meat/seafood, spices, pasta, beans (dried and canned), wine, beer, tea, coffee, maple syrup, greek yogurt, high fiber cereals, whole grain bread, vegetable oils (olive, canola, peanut, sesame), butter and margarine, eggs, almond or soy milk.

Just one?

I always, always have fresh spinach.

And avocados.

And eggs.

Never wake up and don't have those 3 in the house.