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- 1 cup creamy peanut butter
- ½ cup unsalted butter, at room temperature
- 1 cup lightly packed light brown sugar
- ½ cup granulated white sugar
- 2 large eggs
- 1 large egg yolk
- 1½ teaspoons vanilla extract
- 1½ cups old-fashioned rolled oats
- 1 cup all purpose flour
- ½ teaspoon baking soda
- ½ teaspoon salt
- ½ cup semi sweet chocolate chips
- ½ cup M&M's candy (more to sprinkle on top)