A different way to stir Kirkland Signature Organic Peanut Butter, item no. 555000
This is not the usual turn-it-upside down recommendation. The version I buy in the Northeast US is two-thirds runny, but with a solid dense layer (4 cm) at the bottom of the jar. Even if you can get a long spoon or fork down there, it's like trying to stir semi-hardened clay.
The solution that works for me (did it this morning) is to empty the jar into a 4-cup measuring cup with a handle (mine is Pyrex 1149485). If your PB is like mine, you'll need a long spoon to pry the bottom layer loose. Once it's in the measuring cup, use an electric hand mixer to blend it all to a single spreadable consistency. Use a canning funnel to pour it into a quart deli container, but any container with a fairly wide mouth will work. A silicone spatula makes it easy to scrape out the measuring cup and funnel.
The process is messy, but not as much as you think. Put down a sheet of parchment or paper towel to make cleanup easier. Disposable gloves are a good idea. For your sanity, set out everything you'll need before you start: Measuring cup, silicone spatula, long spoon, electric hand mixer plugged in and with beaters attached, canning funnel, and some paper towels. Trying to get this stuff out of your cabinets with PB stuck to your fingers makes cleanup harder. Good luck!