These chewy M&M confetti cookie bars are a quick and easy treat perfect for back-to-school snacks, featuring a soft, chewy texture with colorful bursts of M&Ms and optional melty chocolate chips.
Do not overmix the dough to keep bars chewy. Use melted butter for a denser texture. Start checking bars at 20 minutes to avoid overbaking. Cool completely before slicing to prevent crumbling. For thicker bars, use an 8×8-inch pan and increase baking time slightly. Chilling dough for 15 minutes before baking can help keep bars thicker and chewier. Letting bars rest overnight improves flavor and texture.
Keywords: M&M cookie bars, chewy cookie bars, back to school snacks, easy cookie bars, colorful cookie bars, chocolate chip bars