DOUBLE DECKER COOKIE BROWNIE BARS WITH M&MS

3/4 CUP BUTTER, SOFTENED
3/4 CUP WHITE SUGAR
3/4 CUP BROWN SUGAR
3 LARGE EGG WHITES
1 LARGE EGG
1 TEASPOON VANILLA
2 1/2 CUPS FLOUR
2 1/2 TEASPOONS BAKING POWDER
1/2 TEASPOON SALT
1/3 CUP COCOA POWDER
1/2 TEASPOON SALT
1/3 CUP COCOA POWDER
1 TABLESPOON BUTTER, MELTED
1 CUP SEMI-SWEET CHOCOLATE CHIPS
1/2 CUP M&MS (I USED HALLOWEEN M&MS :) )

PREHEAT OVEN TO 375 F. LIGHTLY GREASE A 13 X 9 X 2 INCH BAKING PAN. SET ASIDE. CREAM BUTTER AND SUGARS UNTIL LIGHT AND FLUFFY. BEAT IN VANILLA, EGG WHITES AND WHOLE EGG. SITR IN 2 1/4 CUPS FLOUR MIXED WITH BAKING POWDER AND SALT; BLEND WELL. ADD SEMI-SWEET CHOCOLATE CHIPS (I USED MINI ONES THAT I GOT AT WINCO) DIVIDE BATTER IN HALF. BLEND TOGETHER COCOA POWDER AND MELTED BETTER; STIR INTO HALF OF THE DOUGH. SPREAD EVENLY INTO PREPARED BAKING PAN. TO THE REMAINING DOUGH, STIR IN 1/4 CUP OF FLOUR AND 1/2 CUP M&MS. SPREAD EVENLY OVER COCOA DOUGH IN PAN. BAKE
20 - 25 MINUTES OR UNTIL EDGES START TO PULL AWAY FROM SIDES OF PAN. CUT INTO BARS. STORE IN TIGHTLY-COVERED CONTAINER.