In a large bowl, whisk together the eggs, sugar, coconut oil and vanilla until smooth.
Add in the oats, oat flour, baking soda, salt and cinnamon and stir together with a rubber spatula until fully mixed.
Fold in the chocolate chips and walnuts. Chill the dough in the fridge for 45 minutes.
Preheat the oven to 350 F.
Line a large baking sheet with parchment paper, and scoop 2 tbsp worth of dough onto the baking sheet, leaving about 1u0022 of space in between each cookie. You can use two baking sheets if needed, or bake them in batches and keep the extra dough chilled while the first batch bakes.
Bake the cookies for 10-12 minutes. Remove them from the oven and let them cool completely.
Store them in an airtight container for up to 1 week.