
Christmas Monster Cookies — Thick, Chewy & Festive
These Christmas Monster Cookies combine hearty oats, creamy peanut butter, melty chocolate, and colorful M&Ms for a cookie that’s bold in texture and bursting with holiday cheer. Ideal for cookie exchanges, edible gifts, or a show-stopping dessert platter.
Ingredients (with roles)
- ½ cup (115g) unsalted butter, softened
— Adds richness, promotes golden edges, and helps create a tender crumb. - 1 cup (240g) creamy peanut butter
— Signature flavor and natural binder for the dough; gives chew and depth. - ¾ cup (160g) packed brown sugar
— Moisture and caramelized sweetness that keeps cookies soft. - ½ cup (100g) granulated sugar
— Balances sweetness and contributes to slightly crisp edges. - 2 large eggs
— Structure and tenderness; emulsifies fats and dry ingredients. - 2 teaspoons vanilla extract
— Flavor enhancer; lifts and rounds the cookie’s profile. - 2 cups (180g) old-fashioned rolled oats
— The chewy backbone of the cookie—don’t substitute with quick oats for the same texture. - 1 cup (125g) all-purpose flour
— Provides structure while keeping cookies soft and slightly cakey in the middle. - 1 teaspoon baking soda
— Gentle leavener to achieve slight rise without puffing the cookie into cakiness. - 1 cup Christmas M&Ms (or colorful chocolate candies)
— Festive color, candy crunch, and chocolate bursts—reserve a few for topping. - 1 cup semi-sweet chocolate chips
— Melty pockets of chocolate in every bite. - ½ cup mini pretzels, chopped (optional)
— Adds a salty contrast for an irresistible sweet–salty balance. - Pinch of coarse salt
— Enhances all the flavors—especially chocolate and peanut butter.
Step-by-step Instructions
- Preheat & prep. Preheat the oven to 350°F (175°C). Line baking sheets with parchment or a silicone mat.
- Cream the fats and sugars. In a large bowl (stand mixer fitted with paddle or hand mixer), beat butter, peanut butter, brown sugar and granulated sugar until smooth and slightly fluffy—about 2 minutes. This aeration helps with texture.
- Add eggs & vanilla. Beat in the eggs, one at a time, then stir in the vanilla extract until fully combined.
- Mix the dry components. In a medium bowl, whisk together the rolled oats, flour, baking soda, and a pinch of salt.
- Combine wet + dry. Gradually fold the dry mixture into the wet mixture until a thick cookie dough forms. Avoid overmixing—stop when just combined.
- Fold in mix-ins. Gently fold in the M&Ms, chocolate chips, and pretzels (if using). Reserve a few M&Ms to press on top of each cookie before baking for a bright presentation.
- Chill (recommended). Chill the dough in the refrigerator for 20–30 minutes. Chilling helps the cookies stay thick and prevents excessive spreading in the oven.
- Scoop & press. Using a cookie scoop (about 2 Tbsp per cookie) or tablespoon, place dough balls onto the prepared baking sheet spaced 2 inches apart. Press a few reserved M&Ms gently into the tops.
- Bake until just set. Bake at 350°F (175°C) for 10–12 minutes. The edges should be lightly golden while the centers look slightly soft—they’ll finish setting on the sheet.
- Cool properly. Let cookies rest on the baking sheet for 4–6 minutes so they set up, then transfer to a cooling rack to cool completely. Store in an airtight container for up to 5 days (if they last that long!).
Why This Recipe Works
This version balances chew (from old-fashioned oats) with tenderness (from butter + eggs) and melt (from chocolate chips). Peanut butter provides depth and natural binding—so you get a cookie that’s thick, yet soft in the center and lightly crisp at the edges. The festive candies create visual appeal and a delightful crunch.
Pro Tips for Perfect Results
- Don’t overbake. Pull cookies when centers still appear a bit soft—carryover heat finishes them without drying them out.
- Chill the dough. A short chill (20–30 minutes) keeps cookies thick and helps flavor meld—longer is fine for convenience (up to 24 hours).
- Use old-fashioned oats. They give the chew and texture quick oats can’t match.
- Customize mix-ins. Substitute white chocolate, chopped nuts, or dried cranberries for seasonal variety.
- For uniform cookies, weigh dough portions or use a 2-tablespoon scoop for consistent baking times.
Serving Suggestions
Serve warm with a tall glass of cold milk, a mug of hot chocolate, or a creamy latte. For a holiday dessert board, pair with peppermint bark, shortbread, and fresh fruit. Package in clear cellophane with a red ribbon for charming edible gifts.
Variations & Dietary Notes
- Nut-free: Replace peanut butter with sunflower seed butter and choose nut-free chocolate candies.
- Gluten-free: Use certified gluten-free oats and swap the all-purpose flour for a 1:1 gluten-free flour blend.
- Vegan: Use vegan butter, flax eggs (2 Tbsp ground flax + 6 Tbsp water = 2 eggs), and dairy-free chocolate chips.
Printable Recipe Card
Yield: 18–24 cookies
Prep: 15 min (+ chill) • Bake: 10–12 min
Ingredients:
½ cup unsalted butter, softened
1 cup creamy peanut butter
¾ cup packed brown sugar
½ cup granulated sugar
2 large eggs
2 tsp vanilla extract
2 cups old-fashioned oats
1 cup all-purpose flour
1 tsp baking soda
1 cup Christmas M&Ms
1 cup semi-sweet chocolate chips
½ cup mini pretzels (optional)
Pinch coarse salt
Method:
1. Preheat 350°F (175°C). Line sheets.
2. Cream butter, peanut butter, brown & granulated sugars.
3. Add eggs one at a time, stir in vanilla.
4. Whisk oats, flour, baking soda, salt. Fold into wet mix.
5. Fold in M&Ms, chips, pretzels. Chill 20–30 min.
6. Scoop 2 Tbsp balls, press extra M&Ms on top.
7. Bake 10–12 min. Cool on sheet 4–6 min, then rack.