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I had a whole bag of Cocoa Puffs that had gone stale, and thought it would be fun to mess around and see if I could bake something with them. So I aimed for muffins. I more or less based it on a banana muffin recipe I make all the time:

  • 2 1/2 cups ground Cocoa Puffs (I used this to replace both flour and sugar)
  • 1 tbsp baking powder
  • 1/4 tsp salt
  • 1/3 cup vegetable oil
  • 1 egg
  • 1 cup milk
  • 1/2 cup vanilla yogurt (I figured this plus extra milk would make up the mass, pH, and moisture content of the bananas)

I didn't really expect it to go well, but I figured I'd probably have bad muffins, not this:

A 12-cup muffin tin covered in a gooey, exploded, chocolatey mess.

The batter was stretchy, like less-sticky bread dough. I spooned it into paper cups and baked it at 400ºF. At first they looked like they were puffing up as expected, then they looked a little imploded in the center and shiny on top, then one by one they burst and started dripping everywhere. I expected 20–25 minutes but had to pull them out at 15. The aftermath was soft but cohesive and a little rubbery, not at all hard to clean.

So, lesson learned: Cocoa Puffs are not flour. But what chemical reaction happened or didn't happen to make it go this wrong?

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    As GdD points out, you can't recreate the same gluten-based structure using baked flour. But you can use other things like potato starch, tapioca flour and eggs to create a similar structure that incorporates the cooked flour. This is essentially what's involved in Passover baking. So, if you want to try this again, look at Passover recipes that include matzo meal.
    – Juhasz
    Commented Jul 25, 2022 at 18:17
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    Unrelated to your question, but these look like if you stuck them in the fridge, they might make delicious ice-cream bowls once they hardened. In which case, that recipe might be worth saving! :D
    – Dewi Morgan
    Commented Jul 25, 2022 at 18:42
  • Here is an idea: Instead of 2 1/2 cups ground of Cocoa Puffs, use 1 cup of ground Cocoa Puffs and 1 1/2 cups of flour. I am no expert here, but it seems to me that would work.
    – Giacomo1968
    Commented Jul 25, 2022 at 23:24
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    @DewiMorgan you stole that thought right off my tongue. It could be good with chocolate sauce too, something decidedly messy in a plate. Eating the "plate" helps with cleanup too, so a win/win !
    – Criggie
    Commented Jul 26, 2022 at 22:21
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    @DewiMorgan Nice thinking! They're not as deep as they look, plus I'm not convinced they would harden or come out of the wrappers in one piece. Could be fun to play around with though!
    – the-baby-is-you
    Commented Jul 27, 2022 at 5:35

3 Answers 3

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Muffins and cakes rise because of chemical leavening agents and the expansion of hot gasses, they stay risen because the flour and sugar forms a structure which traps the air, then solidifies enough to hold its shape once the expansion has stopped. Cocoa puffs are made in a process called extrusion, where batter is pressurized and shot out in little spurts. On the release of this pressure the little squirt of batter expands and almost crystallizes in the same way as a muffin or cake, in other words puffs are cooked by a different method, but the processes which make them hold their shape is the same.

These processes aren't reversible, you can't turn a cake back into flour, milk, sugar and eggs. Grinding up cocoa puffs is essentially the same thing as grinding up dried cake, they may absorb some moisture but as the chemical and physical changes involved in crystallization have happened it won't happen again.

What it looks like is that your batter expanded enough to go over the top of the muffin pockets and then outward, then collapsed because there was no structure to keep the shape.

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what chemical reaction happened

It wasn't a chemical reaction, it was a physical reaction.

Everything you describe sounds like your batter was able to trap air much better than a typical muffin batter - you say yourself it was sticky. When it started baking, the air expanded, due to the baking powder, the production of steam, and the plain old gas laws (expansion under heat). But you did not have a muffin batter, which creates a porous inner structure and sets into it under heat. Instead, it was like a balloon inflating. And then the balloon wall was not strong enough to contain the hot gas, and it burst.

You can see another argument for that theory in your own observation that the cooled-down results were "rubbery". It seems to have been stretchy and rubbery like a balloon, and to have acted like an overinflated balloon.

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    But why do cocoa puffs do that I wonder? 🧐
    – Cory Klein
    Commented Jul 25, 2022 at 17:42
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    @CoryKlein the correct-but-not-really-explaining-it answer is that apparently, the spatial distribution of molecules in a mixture of ground cocoa puffs and the other ingredients happens to have the right amount of elasticity and other parameters (I don't even know enough engineering to name them). For an answer that is more of an explanation, one would need a degree in chemistry, access to a lab, and a few months to years of spare time.
    – rumtscho ♦
    Commented Jul 27, 2022 at 7:20
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Flour is not merely a carbohydrate-rich powder used to add substance to a batter or dough. It contains gluten which is essential to the structure of most baked goods. Your cocoa puffs are processed puffed grain, which is not flour and shouldn't be expected to behave similarly.

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    I believe the OP understood that when seeing the results, but is asking for an explanation of the exact mode of failure.
    – rumtscho ♦
    Commented Jul 25, 2022 at 8:45

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