Regular M&M’s and most of the standard flavors such as Peanut and Almond have no gluten ingredients. Do avoid the Pretzel and Crispy M&M’s, and use caution with special or seasonal flavors, which may be manufactured on lines where there is a risk of cross-contamination.
Beat the butter and sugars in a large bowl. Blend in the egg, egg yolk, vanilla, maple syrup, and baking soda, followed by the peanut butter.
Use a spatula to mix in the oats and the chocolate chips.
Pour the batter into the prepared loaf pan. Bake at 350°F for 50 to 60 minutes.
Press the dough into the pan. Sprinkle the M&M’s on top and lightly press into the dough.
Bake for 16 to 17 minutes, or until lightly browned, but not completely firm.
Let the bars cool before slicing. They will continue to firm up as they come to room temperature.
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