I have not tried any of the Bake with Jacks blog recipes, I will have a look later today and see if they are likely make it to my Christmas Bake ! Thanks for the info on the milk powder, very interesting, is there a technical reason why it will not work ? Also if I managed to get a high heat version would this soften the loaf ? Thanks.
The crust problem is probably a combination of factors:
- Not controlling the humidity during proofing
- are you proofing in the open, letting a skin form on the surface of the dough? A skin forming on the dough will cause a hard crust.
- place the dough in a very large plastic bag, then place on a baking sheet and put in a draft free area. I use my oven.
- I assume you are baking in a tin since you use the term “loaf”. Is there enough dough in the tin? If you are using too large of a tin, it will cause the crust to be thick and dry as the volume to dough is not enough to absorb all the heat from the tin.
- Too high a temperature #1: if using a tin, what type of metal is the tin? Dark metal, anodized aluminum, and coated aluminum radiate heat more intensely than uncoated metal. If you are using one of these tins, reduce the oven temperature. The manufacturers of these tins in the US normally recommend up to 25°F reduction in oven temperature to offset the over-baking problems caused by these tins.
- Too high a temperature #2: oven temperature: use a oven thermometer to ensure the correct temperature of your oven. If using one of the tins mentioned above, then you must reduce the baking temperature.
The milk powders have very different functionalities determined by three major factors: moisture content, protein content, and particle size. There are other factors, but these are the major factors used to categorize functionality of milk powders.
High Heat Non-Fat Dried Milk Powder is processed for a minimum concentration of whey protein (34%). In other words it has a minimum concentration of milk solids (proteins). So its water solubility is specific for certain applications.
Low heat and medium heat milk powders are also processed to specific standards for milk solids since they will be used primarily as milk replacements (reconstituted for drinking or as milk replacement in dry mixes (thickener/stabilizer milk products, powdered milk, package cake mix, puddings, smoothies, etc.).
High Heat Non-Fat Dried Milk Powder is not as readily soluble as low and medium heat milk powders since it is not reconstituted and used like a milk replacement. It is used primarily as an emulsifier.
The moisture content also determines performance. It determines how the protein binds. It also affects color and texture. Too much moisture causes nonenzymatic browning, while too little causes fat oxidation.
The particle size is also a factor. Since the high heat milk powder is less soluble, it has to have a different particle size than the low and medium heat powders.
You can read more about milk powders in food production in the attached paper.
A good rule of thumb when you are tempted to try something you read on the Internet is to research the food science behind it.
https://onlinelibrary.wiley.com/doi/full/10.1111/j.1541-4337.2012.00199.x