Combine the first 5 ingredients in a large bowl and set aside.
In another large bowl combine butter, sugar, brown sugar and vanilla. Beat with mixer until smooth. Drop 1 egg at a time until well combined.
Add dry ingredients to wet ingredients by 1/2 cup at a time until combined. Fold in mini chocolate chips. Drop by tbsp full onto slightly greased cookie sheet.
Bake for 6-8 minutes until almost done. Remove from oven and press a few mini marshmallows and chocolate bar peices into cookie. Replace in oven for another 2-4 minutes until cookie is done. Cook on a wire rack.