Preheat the oven to 350 F. In a medium bowl, whisk together flour, oats, salt, and baking soda. In a large bowl, combine butter with both sugars until fluffy. Add in egg and vanilla extract, and mix until smooth.
Add in the flour mixture, and mix until it is fully combined. Roll the cookie dough into balls, and place them onto a large ungreased baking sheet. Bake for 10-12 minutes.
Remove from the oven, and place one heart shaped chocolate on each cookie.