Beat butter at medium speed with an electric mixer until fluffy; add sugars, beating well. Add eggs and vanilla, beating until blended.
Process oats in a blender or food processor until finely ground. Combine oats, flour, and next 3 ingredients. Add to butter mixture, beating well.
Stir in chocolate morsels, chopped candy bars, and pecans.
Shape into 1 1/2-inch balls, and place on baking sheets.
Bake at 375° for 8 to 10 minutes or until lightly browned. Remove to wire racks to cool.
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