I'm new to this board but wanted to add my two cents in. I love a good puffy chocolate chip cookie and found this recipe in the America's Test Kitchen cookbook. It makes the best cookies ever. In fact my husband took some to work today and none are coming home.
1 cup of butter (not margarine) melted and cooled
1 1/4 c. brown sugar
1/2 c. white sugar
2 egg yolks
1 TBS. vanilla
3 1/2 c. flour
3/4 tsp. baking soda
1/2 tsp. salt
1 pkg. chocolate chips
1/2 pkg. toffee chips
Heat oven to 325 degrees.
Mix flour, baking soda, salt in bowl. Set aside.
Cream together melted butter and sugars. Add in eggs, egg yolks and vanilla. Mix until cominbed (2 minutes). Add flour mixture to butter/sugar/egg mixture. Mix in chocolate chips and toffee chips.
Measure out 1/4 c. of dough. Roll into ball. (I found I could place about 6 cookies on a sheet at this size.) Bake in oven 17-20 minutes. Remove from oven but leave on sheet for additional 10 minutes.
Notes: I use shiny aluminum baking sheets. I have a stainless steel one but it gets to hot. The solution to this is to buy a Silpat baking mat (http://www.amazon.com/Silpat-2-Inch-Nonstick-Silicone-Baking/dp/B00008T960
). This reduces the amout of heat the cookie sheet gives off. I found that when my cookies did come out flat it was because of using the stainless steel sheet without the baking mat.