Mix together butter and brown sugar. Mix it until really combined. It will not get light and fluffy because there is more sugar than butter.
Add eggs one at a time and vanilla.
Add flour, oats, baking soda, and salt.
Mix until combined.
Pour in sunflower seeds.
Drop onto a parchment lined baking sheet using an ice cream scoop. Smooch them down a little bit.
Bake in a preheated 350 degree oven for 8 to 10 minutes.