Rainbow Blondies

Yield:	12 Servings
Categories:

1	c	Butter or margarine
1 1/2	c	Firmly packed light brown sugar
1	lg	Egg
1	ts	Vanilla extract
2	c	All-purpose flour
1/2	ts	Baking soda
12	oz	"M&M's" Semi-Sweet Chocolate Mini Baking Bits
1	c	Chopped walnuts or pecans