Preheat the oven to 350℉ and line 2 large baking sheets with parchment paper.
Using the paddle attachment of your stand mixer, mix the butter and brown sugar well.
Add the eggs one at a time while the machine continues to run. Add the vanilla.
Add the flour, oats, baking soda, and salt. Mix until fully combined.
Stir in the sunflower seeds.
Using an ice cream scoop, transfer mounds of the dough onto the baking sheet, making sure to space them out a little. Flatten them down a bit with your hand or the back of a spoon.
Bake the cookies for 8 to 10 minutes.
Allow the cookies to cool on the baking tray for 5 minutes before transferring them to a rack to cool completely, approximately 30 minutes.