10-Minute Monster Mouth Apple Slices Kids Crave

Name: **10-Minute Monster Mouth Apple Slices Kids Crave**
Prep time: 10 min
Total time: 10 min
Cuisine: American
Ingredients: 2 apples; 1/4 cup peanut butter; 1/4 cup mini marshmallows

Author: lia

Published: August 16, 2025

Updated: August 16, 2025

Monster Mouth Apple Slices (Apple slices with peanut butter and mini marshmallows)

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Every Halloween, my kitchen turns into a mad scientist’s lab—except instead of bubbling potions, we’ve got Monster Mouth Apple Slices snapping their peanut butter jaws! These silly, crunchy-sweet treats became our family tradition after my 5-year-old declared regular apples “too boring” for trick-or-treat night. Now we assemble these goofy grins together, giggling as marshmallow teeth go crooked and peanut butter ends up everywhere (including hair—trust me, it happens).

What I love most? You can whip up a batch of these monster mouths in 10 minutes flat—no fancy skills needed. Just crisp apple slices, creamy peanut butter, and mini marshmallows that transform into the perfect Halloween snack. Kids adore making them (and pretending to get bitten!), while parents secretly appreciate the fruit-and-protein combo. Pro tip: Make extra. These disappear faster than ghosts in daylight!

Table of Contents

Why You’ll Love These Monster Mouth Apple Slices

Monster Mouth Apple Slices (Apple slices with peanut butter and mini marshmallows) - detail 1

These little monsters aren’t just adorable—they’re downright irresistible for so many reasons:

10-minute magic: From zero to Halloween hero faster than you can say “Boo!”—no baking, no fuss, just crunchy-creamy goodness
Kid-approved fun: Let tiny hands assemble the marshmallow teeth (crooked smiles encouraged!) for edible crafts they’ll actually eat
Sneaky nutrition: Apples + peanut butter = a snack that feels like a treat but packs protein and fiber
Instant party hit: That “OMG so cute!” reaction when you bring out a plate of these grinning mouths? Priceless.

Ingredients for Monster Mouth Apple Slices

Here’s all you need to create these adorably spooky snacks (and yes, you probably have most in your pantry already!):

2 crisp apples (I love Honeycrisp or Granny Smith—core them and slice into 1/4″ wedges)
1/4 cup creamy peanut butter (the natural kind works best—just stir well if oily!)
1/4 cup mini marshmallows (trust me, regular-sized marshmallows look like Chiclets—too big!)

Don’t have peanut butter? Almond butter or sunflower seed butter make great swaps. And if marshmallows aren’t your thing, try thin almond slices for “fangs”! You can find more fun snack ideas on our Pinterest page.

How to Make Monster Mouth Apple Slices

Let’s turn those apples into grinning monsters—it’s so simple, my preschooler could do it (and does, with plenty of marshmallow “accidents” along the way!):

Slice with care: Cut apples into 1/4-inch wedges—too thin and they’ll snap, too thick and they won’t “bite” right. Pro tip: A mandoline makes uniform slices in seconds!
Butter them up: Spread peanut butter on one side of each slice—about 1/2 teaspoon per slice. Keep it thin enough to sandwich but thick enough to hold those marshmallow teeth.
Toothy grin time: Press mini marshmallows firmly into the peanut butter in a zigzag pattern. Crooked teeth = more personality! (If they won’t stick, dab a tiny extra PB on each marshmallow.)
Sandwich the screams: Top with another apple slice, PB-side in, and press gently. Listen for that satisfying crunch—that’s how you know it’s perfect!
Serve immediately before the apples start giggling (a.k.a. browning). Bonus points for arranging them in a “roaring” circle!

Monster Mouth Apple Slices (Apple slices with peanut butter and mini marshmallows) - detail 2

Tips for Perfect Monster Mouths

Blot apple slices with a paper towel—dry surfaces help peanut butter stick better
Use a toothpick to position stubborn marshmallows without peanut butter fingerprints everywhere
For extra creep factor, leave some marshmallows sticking out like jagged vampire teeth!

Ingredient Substitutions & Variations

Got allergies or just want to mix it up? No problem—these monster mouths are super flexible. Here are my favorite twists:

Nut-free? Sunflower seed butter works like a charm—just note it’ll turn the “gums” slightly green (bonus monster effect!).
Marshmallows too sweet? Try thin almond slices for sharp fangs, or shredded coconut for crooked “zombie teeth.”
Apple options: Tart Granny Smiths hold up best, but Fuji or Pink Lady add extra sweetness if your monsters prefer it.

Warning for allergies: Always check labels—some sunflower butters are processed with nuts!

Serving and Storing Monster Mouth Apple Slices

Here’s the monster truth—these apple slice mouths are happiest when eaten right away! The crisp crunch and marshmallow giggles fade fast after assembly. If you must store them (maybe you’re prepping for a party?), give the slices a quick spritz of lemon juice first and refrigerate in an airtight container. They’ll stay “alive” for about 2 hours before turning into sad, brown zombies. My trick? Prep all ingredients separately and let kids assemble right before serving—freshness guaranteed and double the fun!

Monster Mouth Apple Slices Nutrition

Let’s be real—no one’s counting calories when monster mouths are snapping at them! But for those curious, here’s the scoop (nutritional values are estimates and vary by ingredients):

Calories: 80 per monster mouth
Sugar: 8g (mostly from the apple and marshmallows—nature’s candy!)
Fat: 3g (thank you, peanut butter’s good fats)

Not bad for a snack that’s equal parts silly and satisfying, right? Now go enjoy those guilt-free grins!

FAQ About Monster Mouth Apple Slices

Got questions about these grinning goodies? I’ve got answers—straight from my monster-making adventures!

“Can I make these ahead?” Bless your organized heart! Prep apple slices and store them in lemon water for 2 hours max. But wait to assemble—peanut butter gets soggy and marshmallows turn into glue. (Trust me, I learned the hard way!)
“How do I stop the browning?” A quick dunk in lemon water (1 tbsp lemon juice + 1 cup water) buys you time. Or cheat with pre-sliced apples from the produce section—they’re treated to stay fresh!
“What if my marshmallows won’t stick?” Tiny dab of extra peanut butter acts like edible glue. Or use a toothpick to “spear” stubborn marshmallows halfway into the apple slice—sneaky!
“Can I use other nut butters?” Absolutely! Almond butter works great, and cookie butter turns these into dessert monsters (just expect stickier fingers!).

Still stumped? Tag me on Instagram with your monster mouths—I’ll troubleshoot in real time!

Did your little monsters go wild for these? Snap a pic of their crooked marshmallow grins and tag me—I live for kitchen chaos photos! Bonus points if peanut butter made it into someone’s hair (again).