In a large mixing bowl, combine the softened butter, brown sugar, and granulated sugar.
Add the egg, vanilla extract, baking powder, baking soda, and salt and combine.
Add the flour and combine.
Add the chocolate chips and Rice Krispie and stir gently to combine with a large spoon.
Place scoops of cookie dough, about 2 tablespoons each, on a cookie sheet, about 12 to a sheet. Flatten slightly and bake for 8-9 minutes. The cookies are done when they just start to turn a very light brown at the edges and are not yet set in the middle.
Notes
Butter Temperature: Having your butter at the right temperature is the best way to ensure a great cookie. Most cookies (but not all) call for softened butter. Make sure that your butter is softened prior to combining it with sugar. It should be soft, but not totally give way if you press on it with your finger, and it should definitely not be melted or close to melted.
Cookies Size: The baking time will depend on how large a scoop of dough you allocate for each cookie. If you add more dough to each cookie, the cookies will be underbaked and the reverse is true if you’re cookies are too small.
Baking Time: Bake the cookies until the edges just start to become a very light brown. The center may look slightly underdone. This is a good thing. For soft chewy cookies, you don’t want to wait until the cookies are totally brown and set in the middle. Pull them out earlier when you just see hints of golden brown and the center is not yet set. They will continue to cook on the pan after you take them out of the oven.
Extra Baking Tips: See my Cookie Baking Guide for extra tips on baking cookies.