Line your 8x8-inch pan with parchment paper, leaving some overhang for easy removal.

Place the peanut butter and honey in a microwave-safe bowl and heat for 1-2 minutes, stirring halfway through until smooth and fragrant, with a slightly bubbly sound.

Add vanilla extract to the melted mixture and stir until well combined—this helps infuse the aroma throughout.

In a large bowl, combine the oats, chocolate chips, and chopped nuts if using, mixing them evenly for a hearty base.

Pour the warm peanut butter mixture over the dry ingredients, stirring thoroughly with a spatula until everything is coated and sticky, with the oats slightly glistening.

Transfer the mixture into the prepared pan, pressing it down firmly with the back of a spatula or your hands to create an even, compact layer.

Place the pan in the fridge and chill for at least 2 hours until the mixture is set, firm, and easy to cut.

Once chilled, lift out the entire block using the parchment overhang and cut into 12 even squares with a sharp knife or pizza cutter.

Enjoy these chewy bars at room temperature or chilled, packed in an airtight container for a portable snack or quick treat.