Step 1

Preheat oven to 350º. Line the bottom and sides of an 8×8 inch baking pan.

Step 2

Bars: Whisk the flour, oats and baking soda together in a large bowl. Set aside.

Step 3

Cream butter and sugars together in an electric mixer on medium speed until light and fluffy, 5 minutes. Add the peanut butter, egg and vanilla one after the other, mixing after each addition. Scrape down the sides of the bowl. With the mixer running on low, slowly add the dry ingredients until just combined, do not over mix.

Step 4

Press ⅔s of mixture into bottom of the baking pan. Stir the M&Ms into the remaining dough. Set aside.

Step 5

Fudge layer: In the microwave, combine all ingredients and cook on 50% power for 1 minute until melted and smooth. Pour over the bottom layer of dough.

Step 6

Mold the remaining dough into flat pieces place on top of the fudge layer, some of the filling will be exposed.

Step 7

Bake for 25 minutes or until the top is lightly browned. Allow to cool completely and then place in refrigerator before cutting into bars.