Preheat the oven to 350°F. Line a baking sheet with parchment paper and set aside.
In a large mixing bowl, add the oats, flour, baking soda, cinnamon, and salt. Mix well.
Stir in the butter, sugar, maple syrup, milk, and vanilla until the batter is smooth. Fold in the chocolate chips or chunks.
Scoop out 1-inch portions of dough, shape into rounds, and lightly flatten with wet hands. Arrange on the prepared baking sheet, leaving space between each cookie. Bake for 10 to 12 minutes or until firm and golden on edges.
Let cool slightly before serving. Optionally sprinkle with flaked salt before serving. Enjoy!
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Notes
Storage and ReheatingLet the cookies cool completely on a wire rack before storing leftovers in an airtight container. You can keep them at room temperature for up to 3 days. You can also refrigerate the cookies, but note that they might firm up or dry a little as a result. For longer storage, you can also put the cookies in the freezer for up to a month.If you want to reheat them, you can do so in the microwave or oven to refresh the texture.