Let a stick of butter stand at room temperature for 45-60 minutes. You can soften in the microwave for 10-15 seconds until softened.
Preheat oven to 357°F.
Place Brittle mix in a bowl and softened butter.
Mix with your hands until well blended.
Place half the dough on an ungreased cookie sheet and form into a heart. Pat down dough to about 1/4 inch thickness. When sculpting your heart make sure to accentuate the shape since it will cook and lose some of the heart-shape.
Place the other half of the dough on another ungreased cookie sheet. Repeat step 3.
Bake 10-13 minutes, until cookie is bubbling and golden in color.
Once the cookies are out of the oven, arrange your M&M's into the warm cookie.
Place the cooled cookie on a piece of cardboard and outline the shape with a knife. Cut out the shape with scissors.
Wrap the cardboard with tin foil.
Place cookie on the heart-shaped tin foil.
Wrap with cellophane and gather the plastic on the top of the cookie. Wrap a pretty ribbon around the cellophane.