In a bowl, whisk the butter and brown sugar until smooth. Add the eggs and vanilla, whisking to incorporate. Stir in the flour, baking soda, and salt. Add the oats and chocolate chips and stir to combine.
Spray the waffle iron with nonstick cooking spray. Using a spoon or small scoop, place the dough onto each waffle section. Close the machine and cook until the cookies are set and beginning to brown. This won't take very long — probably two or three minutes, depending on the heat of your waffle iron. (They will be soft when you remove them and will firm up as they cool.) (My waffle iron's light went on to tell me they were done, which was at about 2 minutes)
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.