Step 1
Make the tangzhong: In a medium pot, whisk together the bread flour and milk until relatively smooth. Set over medium-low heat and cook, whisking constantly, until the mixture thickens into a texture not unlike mashed potatoes or grits, 2 to 3 minutes. You may see lumps at first, but as you continue to whisk and the flour cooks, your mixture will smooth out.
Step 2
Make the bread: Remove the pot from the heat and whisk in the cream until smooth, which will cool down the mixture and add some necessary fat. To the creamy mixture, add 4 cups/576 grams bread flour, the maple syrup, egg, salt and yeast, and stir with a wooden spoon or rubber spatula until you can no longer see any streaks of egg or flour. Cover the pot with a lid and let sit in a warm place to proof and hydrate until doubled in size, 1 to 2 hours.
Step 3
To knead by hand, keep ½ cup/72 grams bread flour next to you. Dust a clean work surface with some of the flour and turn the dough out onto the surface. Dust some more flour on top of the dough and on your hands, and knead the dough into a ball using both hands. As you start to feel the dough get sticky, add more of the flour. The goal here is to not use more than that ½ cup of flour to knead the dough and, at the same time, to develop enough gluten in it so that it’s no longer sticky, 5 to 7 minutes. Alternatively, knead with a stand mixer: Transfer the dough from the pot to the bowl of a stand mixer fitted with the dough hook attachment. Knead on medium-low speed for 15 minutes; it will become pretty sticky and cling to the bowl. Turn the dough out onto a floured surface. Dust some more flour on top of the dough and on your hands, and form the dough into a ball using both hands, adding more flour as needed.
Step 4
Grease a 9-by-5-inch loaf pan with cooking spray. Cut the dough in half with a knife, then flatten each piece using your hands, pulling the corners of each piece up and over the center, all around, so that you’re creating two tight balls. Twist the pulled-up edges to seal and turn the balls over so their smooth sides are facing up. Nestle the two balls side by side in the pan and let sit, covered with a clean kitchen towel, in a warm place in your kitchen until the dough balls have risen an inch above the rim of the pan, 1½ to 2½ hours.
Step 5
Meanwhile, heat the oven to 350 degrees. Bake the bread until the crust is dark brown and an instant-read thermometer inserted in the center reads 185 to 190 degrees, 40 to 45 minutes.
Step 6
Remove from the oven and let cool in the pan for 5 minutes before taking out the bread and slicing into it. (Technically it should cool completely, but come on: There’s nothing like the glorious experience of tearing into a fresh, warm loaf of sweet milk bread.) The bread will keep for up to 3 to 4 days in a closed container at room temperature.