1. Preheat oven to 350°F (175°C). Line two baking sheets with parchment paper.
2. In a medium bowl, whisk together flour, baking soda, and salt. Set aside.
3. In a large bowl, beat butter and sugar until light and fluffy, about 3 minutes.
4. Add eggs one at a time, beating well after each addition. Stir in molasses, vanilla extract, and buttermilk.
5. Gradually add flour mixture to wet ingredients, mixing just until combined.
6. Fold in rolled oats.
7. Using a cookie scoop or spoon, drop dough onto prepared baking sheets, leaving about 2 inches between each cookie. Flatten cookies slightly with the back of a spoon.
8. Bake for 10-12 minutes, until edges are lightly golden brown and centers are still slightly soft.
9. Remove from oven and let cool on baking sheet for a few minutes before transferring to wire racks to cool completely.
Enjoy your delicious Grandma's Soft Molasses Cookies! These cookies are perfect for any occasion and will surely bring back warm memories of grandma's kitchen.