Line your 8x8 inch pan with parchment paper, letting the edges hang over the sides so you can lift the bars out later. Set it aside.

Combine the peanut butter and honey in a microwave-safe bowl. Microwave for 30 seconds, stir well, then microwave another 15 seconds if needed. You want the mixture to be loose and pourable, not thick and clumpy. Alternatively, warm them together in a small saucepan over low heat, stirring until smooth.

Pour the warm peanut butter and honey mixture into a large mixing bowl. Stir in the vanilla extract, cinnamon, and salt until combined.

Add the rolled oats and raisins to the bowl. Stir everything together with a rubber spatula until all the oats are evenly coated and the raisins are distributed throughout. The mixture will be thick and sticky, which is exactly right.

Transfer the mixture into your lined pan. Press it down firmly and evenly using the back of the spatula or your clean hands. Press hard into the corners and edges so the bars hold their shape when sliced. The more firmly you pack them, the better they hold together.

Refrigerate for at least one hour, or overnight for best results. When the bars feel firm to the touch, lift them out of the pan using the parchment overhang and place on a cutting board.

Slice into 12 bars using a sharp knife. Cut straight down rather than sawing back and forth to keep the edges clean. Serve cold or at room temperature.