1) Mix sugar, brown sugar, butter, and egg together in a large mixing bowl.
2) Add salt, baking soda, and vanilla to the mixture. Mix well.
3) Sift flour into bowl. Mix wet ingredients just barely.
4) Add chocolate chips and pretzels. Mix.
5) Bake in a 375 degree oven for 8-10 minutes. (I like to undercook them just a little bit, then pull them out and let them finish cooking on the pan)