Irresistible Monster Mash Bars

These Monster Mash Cookie Bars bring together all the fun of colorful candies and rich chocolate chips in a chewy, satisfying treat perfect for any celebration or just a cozy snack. The bars are easy to make, with familiar ingredients you likely already have on hand, and they bake up soft with just the right amount of crunch on the edges.

I first made these for a Halloween party, and they disappeared so fast everyone asked for the recipe. They quickly became a goto for when I want something sweet and fun without fuss.

Ingredients

• Unsalted butter: softened makes the texture tender and rich choose fresh butter for the best flavor
• Brown sugar: packed adds moisture and a deep caramel flavor
• Granulated sugar: balances sweetness and helps with crispness so measure accurately
• Large eggs: bind the dough together and give structure opt for room temperature for smooth mixing
• Vanilla extract: enhances overall flavor don’t skimp on quality pure vanilla is key
• Allpurpose flour: provides the base structure use unbleached for a cleaner taste
• Baking soda: helps the bars rise lightly for a soft edge note its freshness impacts effectiveness
• Salt: balances sweetness and enriches flavor table salt is fine but kosher salt works well too
• Chocolate chips: contribute melty pockets of sweetness pick semisweet for contrast
• Colorful candy pieces: like M&Ms or Skittles add a bright festive touch pick candies that won’t bleed too much
• Chopped nuts: optional adds a crunchy texture try toasted walnuts or pecans for extra flavor

Instructions

Slam the Oven Ready:

Preheat your oven to 350 degrees Fahrenheit and prepare a 9 by 13 inch pan by greasing it or lining it with parchment paper so bars won’t stick and are easy to remove

Mix the Sugars and Butter Until Light:

In a large bowl, use a mixer to cream the softened butter with the brown sugar and granulated sugar until it looks light and fluffy about 2 to 3 minutes on medium speed this builds the creamy base for the bars

Add the Eggs and Vanilla:

Beat in the eggs one at a time mixing well after each addition to ensure even incorporation then stir in the vanilla extract for depth of flavor

Combine Dry Ingredients Separately:

In another bowl, whisk the flour baking soda and salt together this makes sure the leavening is evenly distributed avoiding pockets of baking soda

Bring Together Wet and Dry:

Gradually add the dry mixture to the wet ingredients stirring gently until just combined do not overmix or the bars can become tough

Fold in Chips Candies and Nuts:

Carefully fold in the chocolate chips colorful candies and nuts if using to distribute them evenly throughout the dough

Spread Dough Evenly in Pan:

Transfer the dough into your prepared pan spreading it into an even layer with a spatula pressing slightly to smooth the top

Bake with Care:

Place the pan in the preheated oven and bake for 25 to 30 minutes until the edges turn lightly golden and a toothpick inserted near the center comes out with a few moist crumbs this means it is perfectly baked and not dry

Cool and Cut with Confidence:

Let the bars cool in the pan for about 10 to 15 minutes then carefully lift them out using the parchment edges and cool completely on a wire rack before slicing into squares so they hold together well

My favorite part is the way the colorful candies melt just enough to stay distinct but add bursts of fruity sweetness. I remember making this with my kids who loved mixing in their candy choices and then sneaking pieces before baking was done. It always brings laughter and a little friendly fighting over the last bars.

Storage Tips

Store cooled bars in an airtight container at room temperature where they keep their softness and flavor for up to four days. For longer storage wrap tightly in plastic wrap and foil then freeze for up to three months. Defrost at room temperature before serving.

Ingredient Substitutions

Butter can be replaced with margarine or coconut oil but expect a slightly different texture and flavor. Brown sugar can be swapped for coconut sugar for a richer caramel profile. Use gluten free all purpose flour for those with gluten sensitivities and check that baking soda is fresh to keep proper rise.

Serving Suggestions

These bars are great on their own or served with a glass of cold milk or a scoop of vanilla ice cream for an extra indulgent dessert. They pair well with a hot cup of coffee or tea too making them perfect for afternoon treats or casual gatherings.

These Monster Mash Cookie Bars are an easy, crowd pleasing treat perfect for parties or cozy snacks. Serve warm with milk or a scoop of vanilla ice cream.

Common Questions About Recipes

→ What makes these bars chewy?

The combination of softened butter, brown sugar, and eggs contributes to a moist, chewy texture that distinguishes these bars.

→ Can I substitute the colorful candies?

Yes, you can swap M&Ms and Skittles for your favorite candies or even dried fruit to vary sweetness and texture.

→ Are nuts necessary in the bars?

Nuts are optional and can be added for extra crunch and flavor, but the bars are delicious without them as well.

→ How do I know when the bars are done baking?

Bake until edges are lightly golden and a toothpick inserted comes out with a few moist crumbs, indicating a soft interior.

→ What is the best way to cool the bars?

Let bars cool in the pan for 10-15 minutes before lifting out and cooling completely on a wire rack to ensure clean slicing.