Line your 8-inch square pan with parchment paper, leaving some overhang for easy removal.
In a dry skillet, toast the oats over medium heat for 3-4 minutes until they smell warm and nutty, stirring constantly. Let them cool slightly.
In a small saucepan, melt the butter over low heat, about 2-3 minutes, until smooth and bubbling gently.
Add the honey and vanilla extract to the melted butter, stirring until combined and slightly thickened.
Pour the warm butter mixture over the toasted oats in a large bowl, then add the peanut butter and stir well until everything is evenly coated and glossy.
Gently fold in the chocolate chips, ensuring they are evenly distributed without melting too much.
Transfer the mixture into your prepared pan, using a spatula or the back of a greased spoon to press it down firmly into an even layer.
Place the pan in the fridge and chill for at least 2 hours until the mixture is set and firm.
Once chilled, lift the entire block out of the pan using the parchment overhang. Use a sharp knife to cut into 8-10 squares, wiping the blade with hot water between cuts for clean slices.
Serve the bars at room temperature for the best chewy texture. Store leftovers in an airtight container at room temperature for up to 3 days or freeze for longer storage.