Everything Cookies

Found this recipe on a blog...but I don't remember who's.  I did change it though!  So this is my version of some bloggers recipe...

Ingredients:
1 cup butter, softened
1 1/2 cups packed brown sugar
2 eggs
1 1/4 cups crunchy peanut butter
1 teaspoon vanilla extract
2 1/2 cups all-purpose flour
1/4 cup cornstarch
Pinch of salt
1 teaspoon baking soda
1/2 teaspoon baking powder
1 cup semisweet chocolate chips
1 1/2 cups pretzel M&Ms OR 1 cup of another kind of M&M's

Directions:
* Preheat oven to 350 degrees.

* Cream together butter and brown sugar. Beat in eggs, peanut butter and vanilla.

* Add flour, cornstarch, salt, baking soda and baking powder. Stir in chocolate chips and pretzel M&Ms.

* Roll into small balls  and place onto greased cookie sheets about 2 inches apart. Flatten slightly because they do not flatten much while cooking. (If you make the balls more than about a tablespoon or so the insides won't cook right!  Don't make them too big!)

* Bake for 13 minutes.