2 cups straight baking oats
1 tablespoon butter
1 cup packed light brown sugar
1 egg
1 teaspoon vanilla extract
3/4 cup peanut butter
2 cups all-purpose flour
1 cup butter, softened
3/4 cup brown sugar
1/2 teaspoon baking soda
1/2 teaspoon salt
Preheat oven to 350 degrees F (175 degrees C).
In a medium bowl, blend oats, butter, brown sugar, egg and vanilla. Stir together. Mix together the oats and peanut butter mixture, then stir in the flour and peanut butter mixture. Drop by rounded spoonfuls onto the ungreased cookie sheet.
Bake for 8 to 10 minutes in the preheated oven, or until a toothpick inserted into the center of the cookie sits flush with the bottom. Allow cookies to cool on baking sheet for 5 minutes before removing to a wire rack to cool completely.
To make the peanut butter filling: Stir together 1/2 cup brown sugar, 1/2 cup butter, 3/4 cup brown sugar, 1/2 teaspoon baking soda and salt. Press the mixture into the center of the cooled cookies.