Preheat oven to 350 degrees and line a large baking sheet with a silpat liner or parchment paper
Place butter and sugars into a medium bowl and stir until well combined. Add beaten egg and vanilla stirring until well combined. Add flour, baking soda, salt. Stir until just combined. Stir in chocolate chips. Using a large cookie or ice cream scoop, place dough onto center of baking sheet. Place chopped Snickers Bars on top of dough. Bake for 12-15 minutes, until golden around edges. Let cool for 10 minutes on baking sheet before removing. Serve room temperature or warm.