Line one or more baking sheets with parchment paper.
Make sure butter is quite soft—if not, pop in the microwave for a few seconds to soften.
In a large bowl, mix together butter, brown sugar, and granulated sugar with a wooden spoon until well-combined.
Add egg and vanilla extract, and stir again.
Then, stir in almond flour, rolled oats, baking soda, cinnamon, and salt.
When fully combined, stir in chocolate chips.
Chill dough in refrigerator for 20-30 minutes.
Scoop out one generous tablespoon of filling at a time, and roll with your hands to make a ball.
Place cookie balls on the parchment paper-lined baking sheet a couple of inches apart.
Bake for 12-15 min, until you can smell them, and they are lightly browned on top.
Put the cookie sheet on a cooling rack and let sit for 3 minutes to let cookies firm up.
Then remove cookies and place directly on cooling rack to finish cooling.
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Notes
I recommend using weights to measure ingredients rather than cup measures, whenever possible. It gives you a much more accurate measurement since the volume of ingredients like almond flour can be quite different with different brands.
Cookie dough can rest in the fridge for up to 24 hours before baking, either in a bowl or already scooped into cookie balls.
To make sure this recipe is completely gluten-free, check your oats to make sure they are certified gluten-free. Some oats are made in processing facilities that are not gluten-free.
You can use light brown sugar or dark brown sugar for this recipe, or a combination of the two. Dark brown sugar will give you more of a molasses flavor in your cookies.
Other ingredients can be used as a replacement for the chocolate chips: try raisins, dried cranberries, coconut, butterscotch or white chocolate chips.
Baked cookies can be stored at room temperature in an airtight container for up to 5 days. Baked cookies can be frozen for up to 3 months.
Unbaked cookie dough balls can also be frozen for up to 3 months. Just roll dough into balls and place on a parchment- or wax paper-lined plate in the freezer until firm. Then you can put the cookie dough balls into a freezer-safe ziplock bag and take out however many you want, whenever you want.