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Export 5 ingredients for grocery delivery
Step 1
Preheat oven to 350F. Line an 8-by-8-inch baking pan with aluminum foil, spray with cooking spray; set aside.
Step 2
In a large, microwave-safe bowl melt the butter, about 1 minute on high power.
Step 3
Wait momentarily before adding the egg so you don’t scramble it. Add the egg, brown sugar, vanilla, and whisk until smooth.
Step 4
Add the flour and stir until just combined, don’t overmix.
Step 5
Stir in the Oreos.
Step 6
Turn batter out into prepared pan, smoothing the top lightly with a spatula.
Step 7
Evenly sprinkle the M&M's over the top, lightly pressing them down with your finger or a spatula.
Step 8
Bake for about 20 to 22 minutes, or until done based on add-ins used. Top should be set and edges slightly firm. A toothpick inserted in the center (if you can find a bare patch to test) should come out clean, or with a few moist crumbs, but no batter.
Step 9
Allow bars to cool in pan for at least 30 minutes before slicing and serving.
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