Preheat oven to 350F.

Put oats in a bowl and add 1/2 cup milk. Let the oaks soak for 5-10 minutes.

Meanwhile, in a large bowl, whisk together the egg and brown sugar.

Add in butter and vanilla and whisk well. Try to get rid of as many clumps as possible.

Add flour, xanthan gum (if using), oat mixture, baking soda, salt, and cinnamon. Mix well.

Add the remaining milk and stir until combined.

With a spoon, stir in the chocolate chips.

Line a 12 cup muffin tin with liners or grease well.

Spoon batter into muffin wells, about 1/4 cup in each.

Bake for 15-18 minutes, or until a toothpick inserted in the center of the muffin comes out clean.