Preheat oven to 350`.
Combine butter, sugar and brown sugar at medium speed of an electric mixer until smooth. Add peanut butter, eggs, corn syrup and vanilla; mix until just combined.
Stir in oats, baking soda and salt using a large wooden spoon. Gently stir in M&Ms and chocolate chip morsels until well-combined.
Drop 1/4 cup portions of dough about 4 inches apart on a baking sheet coated with cooking spray. Bake at 350` for 12 to 15 minutes or until lightly browned. (Bake less time for a chewy cookie, more time for a crunchy one.) Let cool for 3 minutes on baking sheets. Remove to a wire rack to cool completely. But eat at least one while it's still warm.