For a crowd-pleasing Christmas treat, look no further than these chewy chocolate toffee cookie bars. Studded with red and green M&M's, these holiday bar cookies are a cute, festive treat.

For the toffee ... and 1/4 cup of chocolate chips over the top of the batter. Bake until a wooden pick inserted in the center comes out clean, 40 to 45 minutes. Let the cookie bars cool at ...