I recently made the pound cake recipe from Stella Parks, but there ended up being a few issues with the cake:
Now of course, I didn't follow the recipe exactly so those issues are no doubt caused by the changes I made. Specifically, what I did differently was:
From Paula Figoni's How Baking Works:
"High-ratio liquid shortening cakes are characterized by high ratios, or baker’s percentages, of liquid and sugar to the amount of fl our. They are formulated to be mixed in a single step that whips large amounts of tiny air bubbles into the batter. While generally considered to be foolproof, things can go wrong if the oven temperature is off.
When the oven temperature is low, for example, a cake’s structure sets later than it should. In the meantime, the batter slowly warms and as it does, it thins out. Air bubbles can rise easily through the thin batter to the surface of the cake, while starch in the fl our can sink to the bottom. If the oven temperature is quite low, the baked cake will have a thick rubbery layer of gelatinized starch along the bottom and a low volume overall. Or it could have a series of thin tunnels running from bottom to top, tunnels that follow the trail of escaping bubbles."
" There are many reasons why high-ratio cake batter can be too thin, which can lead to collapse, tunneling, or the formation of a gummy layer on the bottom of the cake. If your formula is reliable and has the proper fl our (usually cake fl our) and the right amount of fat and sugar, check that the batter is being mixed correctly and that the oven temperature is not too low. If there is too little mixing, fl our and other driers will not properly hydrate and thicken. If the oven temperature is too low, the batter will remain thin for too long before structure sets. Baking is a balancing act, not just of tougheners and tenderizers, but of mixing and baking rates and times."
The Figoni text also states how tunneling in quick breads are caused by a different issue: overmixing causing overdevelopment of gluten. However, since the pound cake recipe is pretty high in sugar and fats, I figured it might be closer to a high-ratio cake formula than a quick bread. For reference, here are quick baker's %s for the recipe:
100% flour
66% butter
116% sugar
70% eggs
66% sour cream
I also found this article from King Arthur: https://www.kingarthurbaking.com/blog/2014/07/15/how-to-prevent-dense-gluey-streaks-in-your-cake
It basically says overcreaming the butter and overmixing after adding flour causes the exact issues I experienced.
From reading those sources and other sources on the internet, I feel like the likely culprits are either a) too low temperature or b) improper mixing. However, I feel that I followed the proper mixing guidelines fairly well, so I can't think of what I should've changed. In regards to the temperature, even with baking at the lowered temperature, I found it wasn't baking evenly. For reference, after 70 minutes of baking, there was still a visibly undercooked section in the middle (in the crack that develops) where it registered 195°F, but parts of the cake that were closer to the edges were at around 208°F. I feel that if I used a higher temperature, it'd bake even more unevenly, causing the edges to be way overbaked and too dry.
- Gummy streaks (crumb is also pretty dense overall, but I think that's how the recipe is formulated to be, especially reading Stella Parks' writeup and the picture on the recipe).
- Numerous medium-sized tunnels.
- The top was nicely domed out of the oven, but collapsed when cooling to create a final fairly flat top.
Now of course, I didn't follow the recipe exactly so those issues are no doubt caused by the changes I made. Specifically, what I did differently was:
- I don't have a 1lb loaf pan (8.5x4.5 inch), so I baked in a nonstick 9x5 inch loaf pan instead.
- Scaled the recipe to 120% because of the larger pan - 9x5 is 117.6% larger in area than 8.5x4.5.
- Because I used a larger pan and it was nonstick, I baked at 325°F instead of the stated temperature of 375°F. Specifically, I was originally planning on baking at 350°F, but decided after the cake had been in the oven for 5 minutes to further decrease it to 325°C. Ended up baking for a total of 72 minutes, to an internal temperature of 202°F.
- I was basing it off of a previous recipe I tried (https://www.joyofbaking.com/PoundCake.html, based off of Rose Levy Beranbaum's recipe), where tried baking it at 350°F and 325°F, and had better results at 325°F.
- Also used all butter, no coconut oil, but I doubt that had any effect.
- Mixed half AP flour (13% protein since Canada) and cake & pastry flour (8% protein) to approximate 10.5% protein flour.
- Before starting, butter was at about 63°F and eggs were at 65°F.
- Creamed for 5 minutes at medium speed (speed 4 on a KitchenAid Pro 600), and butter mixture was at 68°F.
- After all the mixing was done, the batter was at 66°F (recipe said should be around 65°F).
- Sifted flour beforehand, and followed recipe for adding it in: alternated with sour cream on lowest speed (Stir speed on the KitchenAid), and mixed only until incorporated.
From Paula Figoni's How Baking Works:
"High-ratio liquid shortening cakes are characterized by high ratios, or baker’s percentages, of liquid and sugar to the amount of fl our. They are formulated to be mixed in a single step that whips large amounts of tiny air bubbles into the batter. While generally considered to be foolproof, things can go wrong if the oven temperature is off.
When the oven temperature is low, for example, a cake’s structure sets later than it should. In the meantime, the batter slowly warms and as it does, it thins out. Air bubbles can rise easily through the thin batter to the surface of the cake, while starch in the fl our can sink to the bottom. If the oven temperature is quite low, the baked cake will have a thick rubbery layer of gelatinized starch along the bottom and a low volume overall. Or it could have a series of thin tunnels running from bottom to top, tunnels that follow the trail of escaping bubbles."
" There are many reasons why high-ratio cake batter can be too thin, which can lead to collapse, tunneling, or the formation of a gummy layer on the bottom of the cake. If your formula is reliable and has the proper fl our (usually cake fl our) and the right amount of fat and sugar, check that the batter is being mixed correctly and that the oven temperature is not too low. If there is too little mixing, fl our and other driers will not properly hydrate and thicken. If the oven temperature is too low, the batter will remain thin for too long before structure sets. Baking is a balancing act, not just of tougheners and tenderizers, but of mixing and baking rates and times."
The Figoni text also states how tunneling in quick breads are caused by a different issue: overmixing causing overdevelopment of gluten. However, since the pound cake recipe is pretty high in sugar and fats, I figured it might be closer to a high-ratio cake formula than a quick bread. For reference, here are quick baker's %s for the recipe:
100% flour
66% butter
116% sugar
70% eggs
66% sour cream
I also found this article from King Arthur: https://www.kingarthurbaking.com/blog/2014/07/15/how-to-prevent-dense-gluey-streaks-in-your-cake
It basically says overcreaming the butter and overmixing after adding flour causes the exact issues I experienced.
From reading those sources and other sources on the internet, I feel like the likely culprits are either a) too low temperature or b) improper mixing. However, I feel that I followed the proper mixing guidelines fairly well, so I can't think of what I should've changed. In regards to the temperature, even with baking at the lowered temperature, I found it wasn't baking evenly. For reference, after 70 minutes of baking, there was still a visibly undercooked section in the middle (in the crack that develops) where it registered 195°F, but parts of the cake that were closer to the edges were at around 208°F. I feel that if I used a higher temperature, it'd bake even more unevenly, causing the edges to be way overbaked and too dry.