Is there a better type of experiment than this cookie experiment? Sorry to all of you scientists out there, but I win. I've seen a lot of rules around cookie baking. The most common being that you MUST chill your dough before cooking, and you shouldn't using completely melted butter. This got me thinking - does following certain cookie rules actually make a difference?

Well it turns out the answer is yes. Quite a significant difference actually.

I baked over 80 cookies for this cookie experiment - and I probably ate at least 10% of those cookies 🙂

This experiment took a fair bit of prep, and pretty much a whole day of baking. So I decided to combine it with my last week at work and get my office friends involved in this taste test as part of my goodbye. My kids named themselves senior taste testers too, and took the job very seriously!! All-in-all I had 17 taste testers. I asked my volunteers to vote for their favourite cookie, and also to let me know their least favourite (although 4 people didn't let me know their least favourite)

I used the recipe from my Classic Chewy Chocolate Chip Cookies post as my control recipe (which I originally got from Sally's Baking addiction). This recipe calls for the following ingredients and rules:

Ingredients:

280g plain flour
1 tsp baking soda
1 and ½ tsp cornflour
½ tsp salt
170g unsalted butter almost fully melted (it’s better not to completely melt it as it can make the cookies greasy)
150g light brown muscavado sugar
100g granulated sugar
1 large egg
1 egg yolk
2 tsp vanilla extract (or vanilla paste)
180g good quality chocolate chips

Rules:

Ensure your butter is very soft, but not completely melted
Refrigerate the cookie dough for at least two hours
Use a mix of brown and white sugar
I also baked each cookie for exactly 12 minutes, with the exception of the ones I baked from frozen - I gave these 13 minutes.

(see the original cookie post for instructions on how to make)

For the experiment, I made one simple change to each of the 8 further batches of cookies I made. These changes were:

Replaced baking soda with baking powder
Baked the cookie dough balls from frozen (i.e go through the refrigeration stage, roll the dough into balls, and then freeze)
Baked the cookies without refrigerating the dough
Baked the cookies after refrigerating overnight - rather than for 2 hours
Used all brown sugar (i.e 250g brown sugar) rather than a mix of brown and white sugar
Used 15% more flour (the idea behind this was to see if I'd get a thicker cookie)
Used completely melted butter instead of very soft/almost melted butter
Used all white sugar (i.e 250g white sugar) rather than a mix of brown and white sugar

Here's a close up and explanation of the results:

1. Replaced baking soda with baking powder:

Replacing the baking soda with baking powder produced cookies that had a had a domed effect in the middle, with the outside edges being very flat and crunchy. They were still tasty cookies, but they weren't chewy at all. 1 person voted for these cookies as their favourite.

2. Baked the cookie dough balls from frozen (i.e go through the refrigeration stage, roll the dough into balls, and then freeze)

I admit, I cooked these cookies for 1 minute longer than the others, as I expected it to need longer with it being cooking from frozen. As it turns out, they don't need longer. 12 minutes would have been just fine (I discovered this later - after further experimentation with a number of cookie dough balls that I decided to freeze for 'emergencies'). These cookies came out of the oven very puffed up and smooth. They sank a little during cooling and went a little rippled as they sank. These cookies had loads of flavour. They were crunchy on the outside and chewy in the middle. 2 people voted for these cookies as their favourite.

3. Baked the cookies without refrigerating the dough

These cookies, although quick to make, were definitely the worst by far. They were firm, crumbly, had a very cracked appearance on top, and a bit of a strange looking shine to them. There was no depth of flavour to these cookies. It was also much harder to shape them into balls before baking. When you refrigerate your cookie dough, it goes a lot firmer, enabling you to mould the cookie dough into a ball in your hands. If you don't refrigerate, you're dealing with a sloppy batch of cookie dough. This meant my hands were sticky, and the dough was basically splodged onto the baking mat. In an attempt to make these ones easier to handle, I also wet my hands before trying to form a couple of them into balls. Interestingly, I found that doing this meant that the resulting cookies didn't have the cracked, shiny appearance. However, they still tasted bland. You can see on this picture that the top cookie was formed with dry hands, and the bottom two were formed using wet hands. 1 person voted for these cookies as their favourite. 11 people voted for these cookies as their least favourite.

4. Baked the cookies after refrigerating over night - rather than for 2 hours

These cookies were soft and chewy with lots of flavour. Not much else to say! 5 people voted for these cookies as their favourite. 1 person voted for these cookies as their least favourite.

5. Used all brown sugar (i.e 250g brown sugar) rather than a mix of brown and white sugar

Definitely one of my favourites. These cookies had a real caramel flavour, they were chewy on the inside, crisp on the outside and were very tasty. The brown sugar produced a darker appearance than the other cookies. 4 people voted for these cookies as their favourite.

6. Used 15% more flour

Using more flour produced a thicker cookie that spread less during baking. They were a little drier than the control cookie. They had less flavour, and a slight floury/cloying texture. Visually, they were probably the most appealing during to their puffy, thick appearance. 2 people voted for these cookies as their favourite.

7. Used completely melted butter instead of very soft/almost melted butter

These cookies were tasty and very soft on the inside. They did have slightly more of a greasy texture than the control. They also spread more during baking than any of the other cookies. 1 person voted for these cookies as their favourite.

8. Used all white sugar (i.e 250g white sugar) rather than a mix of brown and white sugar

These cookies were reasonably thick and very pale looking. They were chewy and soft, although they were quite dry at the edges. As expected, they had less of a caramel flavour than the control cookies. No-one voted for these cookies as their favourite.

Finally, here's the control cookie

An all round, tasty, soft, chewy cookie. 1 person voted for these cookies as their favourite. 1 person voted for these cookies as their least favourite.

Conclusion:

The overall favourite from the taste experiment was cookie number 4 (where the cookie dough had been refrigerated overnight). The overnight refrigeration really allowed those flavours to fully develop. Cookie 5 (all brown sugar) came a close second.

Based on these results (and if you like a very flavoursome, soft and caramelly cookie) it may well be worth making your cookies using only brown sugar, and refrigerating the dough overnight.

For me, I'll also be ensuring I have a good stock in the freezer so I can put one in the oven whenever the craving strikes!

What do you think? Have you done any similar experimentation? Which one do you think you'd choose as favourite?

As a reminder, here's the basic control recipe (however the experiment results suggest you use just brown sugar instead of a mix of brown and white, and also chill the mixture overnight or cook the dough balls from frozen):

The Cookie Experiment Recipe:

Hi I’m Nicky

I love to cook and I want to share with you my favourite, delicious family friendly recipes. I want to inspire you to create fantastic food for your family every day.