Peanut Butter Cup Stuffed Monster Cookies

These peanut butter cup stuffed monster cookies are pure chaos in the best way. A crisp, chewy oatmeal cookie studded with candy-coated chocolates hides a whole miniature peanut butter cup that melts into a glossy, molten center.

Baked in just 11 minutes at 350°F, they deliver peanut butter overload in every single bite. The contrast of textures—crunchy oat edges, soft cookie crumb, and that warm, liquid peanut butter-chocolate core—makes these cookies impossible to resist.

Monster cookies are a classic American treat, known for their hearty oats, candy-studded dough, and generous peanut butter flavor. This version takes them over the top by stuffing a whole miniature peanut butter cup into the center of each cookie.

As they bake, the candy melts into a rich, molten pocket that stays soft and gooey long after the cookies come out of the oven. The dough comes together quickly with pantry staples, and the 11-minute bake keeps the centers tender while the edges turn golden. Perfect for parties, bake sales, or a weeknight treat, these cookies are as fun to make as they are to eat.

Ingredients

Why this recipe works

The combination of creamy peanut butter in the dough and a whole peanut butter cup hidden inside creates a double dose of peanut butter flavor.

The dough itself is enriched with butter and brown sugar, which gives it a chewy texture and a deep, caramel-like sweetness. Rolling the dough around the candy ensures the cup is fully sealed, so it melts into a molten pocket rather than leaking out during baking.

Baking at 350°F for just 11 minutes is the key to achieving the perfect texture. The oats and flour provide structure, while the high sugar content helps the edges crisp without drying out the center. The hidden peanut butter cup melts at the same rate as the dough bakes, so when you pull the cookie apart, you get a glossy, molten center that contrasts beautifully with the chewy cookie exterior.

Notes and substitutions

Use creamy peanut butter for the smoothest dough, but crunchy works too if you like extra texture. The butter should be softened to room temperature so it creams easily with the sugar. Old-fashioned rolled oats give the cookies a hearty chew; quick oats will work but produce a softer texture. Choose miniature peanut butter cups that are firm and well-wrapped so they hold their shape until baked.

An electric mixer makes creaming the butter and sugar easier, but a sturdy spoon works as well. If the dough feels too sticky, chill it briefly before shaping.

You can use any candy-coated chocolate candies you like, but the classic M&M's-style mix of colors gives these cookies their signature monster look. For a neater finish, press a few extra candies onto the tops of the dough balls before baking.

• Creamy peanut butter: Crunchy peanut butter for extra texture, or almond butter for a different nut flavor (note: texture and spread may vary).
• Unsalted butter: Salted butter, just reduce the added salt to 1/4 tsp.
• Candy-coated chocolate candies: Chocolate chips or chopped chocolate, but the classic monster cookie look comes from the candy coating.
• Miniature peanut butter cups: Use regular-size peanut butter cups cut in half, or any chocolate-peanut butter candy that melts well.

Equipment

• Mixing bowls
• Electric mixer (optional)
• Baking sheet
• Parchment paper
• Cookie scoop or spoon
• Cooling rack