Preheat oven to 350°F. Line a baking sheet with parchment paper or silicone baking mat.
In a large bowl, mix together peanut butter, brown sugar, eggs and vanilla until smooth.
Add in oats and sprinkle baking soda over oats. Stir into batter until evenly mixed. Stir in chocolate chips.
Divide cookie dough into 8 dough balls. Place them about 2 inches apart on baking sheet. Flatten dough balls until they become thick discs (about 2 1/2 inches wide).
Bake cookies for 9-11 minutes or until surface of the cookies look cooked and the edges are barely starting to turn a golden brown. Do not attempt to remove the cookies as they will not yet be set.
Let cookies cool directly on the baking sheet for 10 minutes, during which time the cookies should firm up. You can then remove the cookies from the cookie sheet.
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.