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Place the egg whites or eggs in a liquid measuring cup. Add additional lukewarm water to reach 3/4 cup (or 180g total weight of egg and water).
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To make the bread from start-to-finish in the bread machine: In the bread pan, place the egg and water mixture, cottage cheese, honey, salt, flour, rolled oats, Harvest Grains Blend, butter, and yeast, in the order listed. (For best results, measure by weight directly into the bread pan; if measuring by volume, gently spoon the flour into a cup, then sweep off any excess.)
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Program the machine on its WHITE or BASIC setting and DARK crust, lock the pan into the machine, close the lid, and press START.
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If adding pumpkin seeds, open the machine’s lid when the bread machine’s alert for additions sounds, add the seeds, close the lid, and allow it to continue its cycle.
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Once the cycle is complete, remove the bread pan from the machine. Tip the loaf out of the pan onto a wire rack and cool completely before slicing.
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To make the dough by hand: Add all of the ingredients except for the pumpkin seeds to the bowl of a stand mixer fitted with the dough hook. Mix on low speed until the dough comes together, about 2 minutes, then increase the speed to medium until the dough is pulling away from the sides of the bowl and is slightly sticky, 5 to 7 minutes. Add the pumpkin seeds, if using, and mix until incorporated.
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Transfer the dough to a greased bowl or container (a 2-quart dough-rising bucket works well), cover, and let rise until doubled in size, 60 to 80 minutes.
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Transfer the dough to a clean work surface. If it’s too sticky to handle, dust it lightly with flour, but resist adding any more than necessary, and use a bench knife or bowl scraper to help release the dough and move it on the surface. Gently stretch the dough to 1"-thick rectangle that's roughly 9" x 7" in size, then roll the dough into a 9" log, pinching the seams together.
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Gently place the shaped loaf in a greased 9" x 5" loaf pan and cover loosely with lightly greased plastic wrap. Allow the bread to proof in a warm spot for 35 to 45 minutes, until it's domed about 1" above the edge of the pan and roughly doubled in size. A finger pressed into the dough should leave a mark that rebounds slowly. Toward the end of the rise, preheat your oven to 375°F with a rack in the center.
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If desired, gently brush the surface of the loaf with lightly beaten egg white and sprinkle with a few pinches of Harvest Grains Blend. With a sharp knife or lame, score the loaf: Make a deep slash (about 1/2" deep) down the length of the loaf.
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Bake the bread for 35 to 45 minutes, tenting with foil as necessary to prevent overbrowning, until the crust is golden brown and the interior temperature measures at least 190°F at the center of the loaf when measured with a digital thermometer.
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Remove the bread from the oven, tip the loaf out of the pan onto a wire rack, and cool completely before slicing.
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Storage information: Store the protein bread in a plastic bag at room temperature for up to 4 days; freeze the sliced bread in an airtight bag or container for up to 2 months.