I made these a few years ago.
These had a good flavor, but tended to break easily. They do contain some brown sugar. I haven't tried them with the Splenda brown sugar.
Peanut Butter Cookies
1 1/2 cups AP flour
1 tsp. baking soda
1/2 tsp. baking powder
1/2 cup + 2 Tbs. peanut butter
1/4 cup margarine
2 Tbs. non-fat cream cheese (I used full fat)
3/4 cup splenda Grandular
3 Tbs. brown sugar
1 large egg
2 Tbs. 1% milk (I used fat-free Lactaid milk)
2 tsp. vanilla
Preheat oven to 375 degrees F. Spray cookie sheet with nonstick cooking spray
Whisk flour, baking soda, and baking powder together; set aside. In a medium mixing bowl, with an electric mixer, beat peanut butter, margarine, cream cheese, Splenda and brown sugar until creamy. Add egg, milk and vanilla. Beat well. Stir in flour mixture. Roll 1-Tbs. sized pieces of dough into balls. Place onto cookie sheet and flatten with a fork forming a criss-cross on top of each cookie. Bake for 9 to 10 minutes. Remove from pan and cool on rack. Makes 26 cookies.