But the main ingredients are creamy natural peanut butter, one of either local honey or local maple syrup, and "old-fashioned" rolled oats.
Stir until combined 200g PB, 135g honey/maple syrup, 5g vanilla extract, 3g sea salt.
To this mixture, add 100g rolled oats, 80g whey, ~200g nuts and seeds (can be crushed or whole, although partially-crushed is a bit easier). I use pecans, pepitas, walnuts, almonds, cashews. Whatever is in the pantry.
Transfer + compress to an appropriate-sized casserole dish (above is good for 8x8) with a large spoon, I usually line it first with paper to make later transfer easier.
Cover + chill for at least 1 hour, then slice with a sharp instrument (I use a pizza slicer, but a chef's knife is great). These proportions yield 12-ish bars. But you can compute the macronutrients for yourself to decide how big a serving should be.
In short, it's pretty similar to granola. Only without baking and without oil. I've found the flavor to vary widely depending on the honey/pb/whey used.
Sometimes, they taste like peanut butter cups. :)