Preheat your oven to 350F. Line a baking sheet with parchment paper.
Put the 1 cup old fashioned oats and the 1 cup walnut pieces in the bowl of a food processor and pulse until finely ground
Add in the 1 1/2 cups oat flour, 2 Tbsp brown sugar, 1 tsp salt and 1/2 tsp baking soda and pulse to combine.
Pour in the 1/2 cup buttermilk and 1/4 cup soft or melted butter and pulse until the dough comes together.
Turn out onto a floured surface and bring the dough together. If it feels wet, knead in a little more flour. If it feels dry add a bit of buttermilk.
Roll out the dough to about 1/4 inch thick. Cut with a 2-inch cookie cutter. Place the cookies on your parchment lined baking sheet about an inch apart. You can prick the crackers with the tines of a fork if you like the look, but it's not necessary, the dough doesn't rise or puff up.
Bake for about 15-18 minutes until just starting to turn golden.
Nutritional information is provided as a courtesy and is an estimate only. This information comes from online calculators. Although The View from Great Island attempts to provide accurate nutritional information, these figures are only estimates.
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