Preheat the oven to 350 degrees F and line a 9x13 baking sheet with parchment paper. Set aside.
Add the peanut butter, honey, melted butter, vanilla, salt and sourdough discard to a bowl and whisk until smooth. If the peanut butter is firm, heat it up slightly in the microwave for easy mixing.
140 grams creamy peanut butter, 200 grams honey, 4 grams vanilla extract, 3 grams salt, 100 grams sourdough discard, 57 grams unsalted butter, melted
Fold the oats into the peanut butter mixture with a rubber spatula, then fold in the mini chocolate chips.
315 grams rolled oats, 150 grams mini chocolate chips
Pour the granola bar mixture into the prepared pan. Using another small piece of parchment paper, firmly press the oats into an even layer. This helps to keep your hands clean!
Bake for 25-30 minutes or until the edges are lightly brown.
Remove from the oven and allow the granola bars to come to room temperature. Then cover and place the bars in the fridge for at least 2 hours to chill.
After chilling, slice into even pieces and enjoy!