Combine the butter, yeast, sugar, salt and 1 cup warm water in a stand mixer fitted with the dough hook attachment. With the mixer on low speed, add 1/2 cup of the flour at a time, waiting for each addition to be fully incorporated before adding more. Once all of the flour is added, knead on medium speed for 8 minutes.
Transfer the dough to the prepared pan, cover and let rise until doubled in size, about 1 hour.
Preheat a toaster oven to 400 degrees F.
Bake, rotating halfway through, until the bread is golden and the internal temperature registers 200 degrees F, about 25 minutes. Let cool in the pan for 5 minutes, then turn out onto a rack and let cool completely.
When measuring flour, we spoon it into a dry measuring cup and level off excess. (Scooping directly from the bag compacts the flour, resulting in dry baked goods.)
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