Cinnamon Sugar Monster Bars

Featured in: Cozy Sweet Treats

These chewy, buttery bars blend the comforting flavors of oats, brown sugar, and a hint of cinnamon. Bright chocolate candies and chocolate chips provide pops of color and richness. A cinnamon-sugar sprinkle tops the dough for an irresistible sweet crunch. Quickly mixed and baked in a single pan, they're simple to prepare and perfect for sharing at gatherings or enjoying as a treat at home. Customize the flavor with different chocolate or butterscotch chips, and serve them with milk or coffee for a classic pairing. Veg-friendly and loaded with nostalgic goodness.

Updated on Thu, 30 Oct 2025 11:02:00 GMT
Chewy Cinnamon Sugar Monster Cookie Bars topped with sweet chocolate candies and spices.  Pin It
Chewy Cinnamon Sugar Monster Cookie Bars topped with sweet chocolate candies and spices. | platefullyjoy.com

Chewy, buttery cookie bars packed with oats, chocolate candies, and a delightful cinnamon-sugar crunch make these Cinnamon Sugar Monster Cookie Bars perfect for sharing or indulging any time.

I first made these for a family game night and they disappeared before the cards were even shuffled. The colorful chocolate candies are always a hit with kids and grown-ups alike.

Ingredients

  • Unsalted butter (1 cup/225 g): Softened for easy mixing and a rich, chewy texture.
  • Brown sugar (1 cup/200 g): Packed, provides moisture and depth of flavor.
  • Granulated sugar (1/2 cup/100 g): Adds sweetness and helps the bars bake up golden.
  • Eggs (2 large): Bind the dough and add richness.
  • Vanilla extract (2 tsp): Enhances the cookie flavor.
  • All-purpose flour (1 3/4 cups/220 g): Gives structure to the bars.
  • Old-fashioned rolled oats (1 1/2 cups/120 g): Add chewy texture.
  • Baking soda (1 tsp): Leavens the bars for a soft bite.
  • Baking powder (1/2 tsp): Adds lift.
  • Salt (1/2 tsp): Balances sweetness and enhances flavors.
  • Ground cinnamon (1 tsp): Warms up the flavor profile.
  • Chocolate candies (1 cup/180 g): Use your favorite brand for colorful bites.
  • Semisweet chocolate chips (1 cup/170 g): Melted pockets of chocolate in every bar.
  • Granulated sugar (2 tbsp): For the cinnamon sugar topping.
  • Ground cinnamon (1 1/2 tsp): For the cinnamon sugar topping.

Instructions

Prep the pan:
Preheat oven to 350°F (175°C). Line a 9x13-inch (23x33 cm) baking pan with parchment paper, leaving an overhang for easy removal.
Cream the butter and sugars:
In a large bowl, cream together softened butter, brown sugar, and granulated sugar until light and fluffy.
Mix in eggs and vanilla:
Beat in eggs one at a time, then mix in vanilla extract.
Combine dry ingredients:
In a separate bowl, whisk together flour, oats, baking soda, baking powder, salt, and cinnamon.
Make the dough:
Gradually add the dry ingredients to the wet mixture, mixing until just combined.
Add the mix-ins:
Fold in chocolate candies and chocolate chips.
Spread the dough:
Spread the dough evenly into the prepared pan.
Prepare the topping:
Mix the cinnamon sugar topping ingredients in a small bowl, then sprinkle evenly over the top of the dough.
Bake:
Bake for 23–27 minutes, until the edges are golden and a toothpick inserted in the center comes out with moist crumbs.
Cool and cut:
Allow to cool completely in the pan before lifting out and cutting into bars.
Deliciously warm Cinnamon Sugar Monster Cookie Bars served fresh from the oven.  Pin It
Deliciously warm Cinnamon Sugar Monster Cookie Bars served fresh from the oven. | platefullyjoy.com

Every time I bake these bars, my family gathers in the kitchen to sneak bites before they cool. They make a sweet addition to holiday trays or school lunches.

Required Tools

9x13-inch (23x33 cm) baking pan, parchment paper, mixing bowls, electric mixer or sturdy whisk, measuring cups and spoons, spatula.

Allergen Information

Contains wheat (gluten), eggs, dairy, and soy. May contain peanuts or tree nuts if using certain chocolate candies. Always check ingredient labels and choose candies that fit your dietary needs.

Nutritional Information

Per serving: 280 calories, 13 g total fat, 38 g carbohydrates, 3 g protein.

Indulgent Cinnamon Sugar Monster Cookie Bars featuring a crunchy sugar topping and chocolate chips. Pin It
Indulgent Cinnamon Sugar Monster Cookie Bars featuring a crunchy sugar topping and chocolate chips. | platefullyjoy.com

Cut the cooled bars into squares and enjoy with a cold glass of milk. They are a cozy treat for any occasion.

Recipe FAQs

Can I use instant oats instead of old-fashioned oats?

Old-fashioned oats are preferred for texture, but instant oats may be used for a softer result.

How do I know when the bars are baked?

Bake until golden edges form, and a toothpick comes out with moist crumbs from the center.

Can I add different mix-ins?

Yes! Try peanut butter chips, butterscotch chips, or a mix of mini chocolate candies for variety.

How should I store these bars?

Keep bars in an airtight container at room temperature for up to five days for best freshness.

Are these bars suitable for vegetarians?

Yes, these bars contain no meat or gelatin, but always verify with the packaging for chocolate candies.

Are there any common allergens?

Bars contain wheat, eggs, dairy, and soy. Some chocolate candies may include peanuts or tree nuts.

Cinnamon Sugar Monster Bars

Chewy bars loaded with oats, chocolate candies, and cinnamon-sugar crunch for a delightful bite.

Time to Prep
20 minutes
Time to Cook
25 minutes
Overall Time
45 minutes
Recipe by Olivia Reed

Meal Type Cozy Sweet Treats

Skill Level Easy

Cuisine American

Makes 16 Number of Servings

Diet Info Vegetarian-Friendly

What You'll Need

Cookie Dough

01 1 cup unsalted butter, softened
02 1 cup brown sugar, packed
03 1/2 cup granulated sugar
04 2 large eggs
05 2 teaspoons vanilla extract
06 1 3/4 cups all-purpose flour
07 1 1/2 cups old-fashioned rolled oats
08 1 teaspoon baking soda
09 1/2 teaspoon baking powder
10 1/2 teaspoon salt
11 1 teaspoon ground cinnamon
12 1 cup chocolate candies
13 1 cup semisweet chocolate chips

Cinnamon Sugar Topping

01 2 tablespoons granulated sugar
02 1 1/2 teaspoons ground cinnamon

Step-by-Step Guide

Step 01

Prepare Baking Pan: Preheat oven to 350°F. Line a 9x13-inch baking pan with parchment paper, ensuring a generous overhang for lifting.

Step 02

Cream Butter and Sugars: In a large bowl, cream the softened butter, brown sugar, and granulated sugar together until the mixture is light and airy.

Step 03

Incorporate Eggs and Vanilla: Add eggs one at a time, blending thoroughly after each addition. Mix in vanilla extract until well combined.

Step 04

Combine Dry Ingredients: In a separate bowl, whisk together all-purpose flour, rolled oats, baking soda, baking powder, salt, and ground cinnamon.

Step 05

Mix Wet and Dry Components: Gradually add the dry ingredient blend to the creamed mixture, stirring just until a uniform dough forms.

Step 06

Add Chocolate Mix-ins: Fold in chocolate candies and semisweet chocolate chips evenly throughout the dough.

Step 07

Spread Dough in Pan: Transfer cookie dough to the prepared pan, smoothing the surface with a spatula for even thickness.

Step 08

Apply Cinnamon Sugar Topping: Combine granulated sugar and ground cinnamon in a small bowl. Evenly sprinkle the mixture atop the dough.

Step 09

Bake Until Golden: Bake for 23–27 minutes, until edges are golden and a toothpick inserted comes out with moist crumbs attached.

Step 10

Cool and Portion: Let bars cool fully in pan. Use parchment overhang to lift out, then slice into bars for serving.

Tools You'll Need

  • 9x13-inch baking pan
  • Parchment paper
  • Mixing bowls
  • Electric mixer or sturdy whisk
  • Measuring cups and measuring spoons
  • Spatula

Allergy Notice

Be sure to review ingredients for allergens. When unsure, talk with a healthcare provider.
  • Contains wheat (gluten), eggs, dairy, and soy (from chocolate candies or chips).
  • May contain peanuts or tree nuts, depending on selected chocolate candies.
  • Check ingredient labels prior to preparation if allergy concerns are present.

Nutrition (For Each Serving)

Nutritional details are meant for general guidance. Don't rely on them for medical reasons.
  • Calorie Count: 280
  • Fats: 13 g
  • Carbohydrates: 38 g
  • Proteins: 3 g