The BEST peanut butter cookies

I forgot I had this recipe, but I love this one, and it turns out great every time. Very available ingredients too!

1/2 cup butter
1/2 cup peanut butter
1/2 cup sugar
1/2 cup brown sugar
1 egg
1/2 t vanilla
1/2 t baking soda
1/4 t baking powder
3/4 cup rice flour
1/2 cup cornstarch

Cream butter, pb, sugars, egg, and vanilla. Then add rice flour, cornstarch, baking powder and soda.
If I'm in the mood for chocolate chip cookies, I add chocolate chips. You can use creamy or crunchy pb depending on your preference.
Bake 325 degrees for 8-10 minutes. I take them out while they're still soft (in my oven that's 9 minutes) and let them cool for 5 minutes on the cookie sheet. They're perfect!