In a small sauce pan, melt butter over medium heat. Continue to cook, swirling pan occasionally, until deep golden brown. Immediately pour butter into a bowl and let cool to room temperature.
Preheat oven to 350 degrees. Line a baking sheet with parchment paper or a silicone baking mat.
In the bowl of a stand mixer fitted with a paddle attachment, or in a bowl with a hand-held mixer, beat the cooled brown butter and sugar on high speed until smooth and creamy, about 3 minutes. Add the egg and vanilla extract and beat until well combined.
Add the flours, baking soda and salt and mix until just combined. Then add the oats and pecan pieces and stir with a wooden spoon. When the ingredients start to come together, use your hands to continue mixing until all the oats and nuts are covered with dough.
Squeeze off chunks of dough and loosely break them apart over the baking sheet, creating large clumps.
Bake the cranola for 15 minutes, remove from the oven and stir gently. Bake for an additional 10 minutes, remove from the oven and stir gently. Bake for an additional 5-10 minutes until clumps are dry.
Remove the baking sheet from the oven and let the cranola cool completely. It will harden as it cools.
Store cranola in an airtight container at room temperature for up to a week, if it lasts that long.
Recipe by Two of a Kind at https://www.twoofakindcooks.com/brown-butter-pecan-cookie-granola/