My go to off-the-shelf rub and all-purpose seasoning is Cookies Flavor Enhancer. It’s a great all purpose seasoning, does justice on a variety of meats and heck, it’s even good mixed with a little mayonnaise for a bologna sandwich.
The promo on the bottle is no lie, it's great on pork, beef, chicken, seafood, baked potatoes, spaghetti, chili, eggs, wild game and more! It truly is, I've tried it on all the above and why I always have a bottle of the stuff on hand.
It goes beyond that too, shake some on lettuce salad. Combine Cookies with some olive oil for a marinade. Want to give those french fries a bit of a kick?..... Cookies.....
The flavors in this mix are simple but balanced and when I say simple, simple is a very good thing. Sometimes a person can over-complicate flavors by doing/adding too much. Cookies is very nicely done with a combination of salt, pepper , garlic, chili powder, meat tenderizer and red pepper. The mix literally enhances flavors just like the name implies.
Cookies Flavor Enhancer gets five out of five Bachelor on the Cheap stars, it's priced right at just over $3 for an eight ounce bottle and in my opinion is the best all-purpose seasoning out there.