Line your 9x9-inch baking dish with parchment paper, leaving some overhang for easy removal.

In a bowl, combine the cashews, walnuts, almonds, pine nuts, rolled oats, and a pinch of salt. Stir to blend them well.

In a saucepan over low heat, combine honey and peanut butter. Stir until just melted and well mixed; this should take about 2-3 minutes.

Pour the warm honey mixture over the nut and oat mixture. Stir thoroughly to ensure all the dry ingredients are evenly coated.

Transfer the mixture to the lined baking dish and press it down firmly into an even layer.

Cover the dish with plastic wrap and refrigerate for at least 2 hours until firm.

Once chilled, lift the bars out using the parchment paper and cut into squares or rectangles.