Preheat oven to 350°F (175°C). Line baking sheets with parchment paper or silicone mats.
In a large bowl, cream butter, brown sugar, and granulated sugar until light and fluffy.
Beat in the egg and vanilla.
In a separate bowl, whisk flour, baking soda, salt, nutmeg, and cinnamon.
Gradually add the dry ingredients to the wet mixture until combined.
Fold in oats and caramel bits.
Drop dough by rounded tablespoons onto prepared cookie sheets, spacing 2 inches apart.
Bake 10-12minutes, until golden brown.
Cool on the sheet for 2 minutes, transfer to a cooling rack, and top with flaky sea salt.