You ever have a cookie recipe that’s just a little too much—in the best way? That’s these Christmas Monster Cookies. Honestly, the first time I made them was because I had way too many half-bags of chocolate chips and mini M&Ms left from Halloween (why do they come in such huge bags?) plus, my kids demanded something ‘Christmassy but huge.’ So, out came the red and green sprinkles, and bam—these slightly unwieldy, always cheerful Cookies have been a December tradition ever since. Also, they’re the perfect excuse to sneak handfuls of dough, which I’m pretty sure is the true holiday spirit.

So, here’s why you’ll fall for these (or at least, why I do)

I bake these when the house is full of noise, Christmas music’s too loud, and it’s honestly a little too late at night to start anything serious. My family just goes bananas for them because they’re packed with peanut butter, oats, and every morsel I can find in the pantry. And, okay, maybe it’s not therapeutic per se, but mashing cold butter into sugar really helps with those holiday stress levels. There’s not much you can mess up—though, more on that in a minute.

Here’s what you’ll need (with a few, let’s say, liberties)

1 cup (225g) unsalted butter, softened (but honestly, I’ve microwaved it when I’m impatient. Just don’t melt it totally—makes the dough weird)
1 cup peanut butter (smooth or crunchy; my granny swore by Jif, but store brand works fine!)
1 cup brown sugar—packed if you remember
3/4 cup white sugar—or just do one big heaped cup of whatever sugar’s left
2 large eggs—room temp is best but who is ever that organized?
1 tbsp vanilla—sometimes I eyeball this
2 tsp baking soda
1/2 tsp salt—if you use salted butter, just skip this
2 1/2 cups old-fashioned oats—quick oats work in a pinch, but the texture changes a bit
2 cups all-purpose flour (could sub half with whole wheat if you’re feeling virtuous)
1 cup red and green M&Ms—I’ve raided the Halloween stash, too, and nobody noticed the color swap
3/4 cup chocolate chips (dark, milk, white, whatever’s lurking in the cupboard)
1/2 cup festive sprinkles—optional, but let’s be real, it’s the holidays

The sort-of step-by-step chaos

Preheat your oven to 350°F (about 175°C) and line two trays with baking paper. Or don’t—if your trays are nonstick, you can probably get away with it.
Grab the biggest bowl in your kitchen. Cream your butter, peanut butter, and sugars together. Hand mixer, stand mixer, even a sturdy wooden spoon and some elbow grease work—I’ve done all three over the years (the wooden spoon is a workout, sort of like what my Nan called ‘the baker’s bicep.’)
Beat in the eggs and vanilla. I usually crack both eggs into a tiny bowl first in case of shell accidents, but you do you.
Sprinkle in the baking soda and salt, then stir in the oats, mixing just until it looks like someone’s idea of porridge gone wild. Don’t panic if it’s not perfectly smooth—it figures itself out.
Fold in the flour gently. The dough will seem a bit dense; that’s fine.
Time for the fun: dump in those M&Ms, chocolate chips, and sprinkles. Stir it up until you’ve got a confetti explosion. This is usually where I sneak a bite. It’s basically required at Christmas, isn’t it?
Scoop out big heaped spoonfuls (I use a medium ice cream scoop, but two spoons work fine). Plop them on the trays, giving them space. They’re monster Cookies, after all—let ’em breathe.
Bake for 10-12 minutes, till the edges are just golden and the centers look slightly underdone. Trust the process; they’ll firm up as they cool. Actually, I find it works better if you slightly underbake because they set up chewy, not hard.
Now, they say let them cool completely on the tray. Sure. In practice, someone always nabs one while it’s molten and regrets nothing. Just don’t touch them too early or the whole thing might fall apart, which, honestly, is also delicious.

Things I’ve figured out the, um, hard way

Don’t sub all the oats with coconut. Makes it a weird, sad mess.
Rushing the mixing just makes tough cookies. Give it a few minutes, even if you’re hangry.
If you only have mini M&Ms, add an extra handful for good measure—nobody ever complained about there being too many!
If your dough looks dry, add a smidge of milk; if it’s oily, it probably just needs more stirring.

Other wild experiments (and a fail or two)

Swapped in chopped pretzels once—pretty good, actually! Great for the salty-sweet fans.
A marshmallow version was less brilliant; turned into mallow lava, so maybe avoid that.
Baked a batch with butterscotch chips (because that’s all I had) and everyone still ate them like they hadn’t seen food in a week.

Got (or don’t got) the gear?

I say an ice cream scoop is super helpful for these, but if you don’t have one? Just two spoons and a little faith. If you don’t even have baking trays, I’ve lined the bottom of a roasting tin and packed them closer together—they turn out like cookie bars. Not bad, honestly.

How to stash your stash (assuming any left!)

In an airtight tin or container, these keep a good 4-ish days before getting slightly stale (though, honestly, in my house it never lasts more than a day!). You can freeze dough balls, too—throw them straight from freezer to oven and just add an extra minute or two baking.

How I like to serve ‘em—plus family ideas

Usually, it’s straight off the tray, standing around the kitchen, but occasionally I’ll sandwich two together with vanilla ice cream for a sort of accidental dessert (not very elegant, but very effective). My sister dunks hers in hot chocolate, which is halfway genius, halfway disaster, but it’s her cup of tea.

Bits I wish I’d known earlier (a.k.a. Pro-ish tips)

I once tried skipping the cooling time—huge mess, and the cookies broke into pieces. Don’t be me. Wait at least ten minutes unless you’re a chaos goblin.
Don’t use natural peanut butter unless you’ve added a little extra flour. Too runny, unless that’s what you want (I mean, maybe it is?).
Baking the second tray right after the first, with a blazing-hot oven rack? Crispy bottoms. Just swap trays top to bottom for even heat.

Cookie Questions… straight form my kitchen table

Q: Can I make these gluten free?: A: Yeah, just swap in your favorite GF flour blend, and double-check oats are certified gluten free. Tastes just as good—promise.
Q: Do they freeze okay?: A: Yep, both dough and baked cookies, but the colors from M&Ms sometimes bleed a little in the freezer. Still yummy.
Q: How do I make them nut free?: A: Easy enough—use sunflower seed butter instead of PB. The flavor’s slightly different, but they still vanish in about 15 minutes.
Q: Can you halve the recipe?: A: Sure can! I’ve done that when we only had a few eggs left. Just don’t try to half a single egg (yes, I made that mistake, it’s as weird as it sounds). Or, here’s a good calculator that can help with awkward measurements: King Arthur Ingredient Weight Chart.
Q: Got links to the gear you use?: A: Not sponsored, just a fan—my trusty scoop is similar to this OXO cookie scoop. Makes life easier.

(Oh, and a little off-topic: if you ever find yourself with leftover holiday M&Ms in, say, February, these are also perfect for what I call “Christmas in July.” I swear food memories work even if the calendar doesn’t.)