Make the dough. Add flour, yeast, salt, and sugar to a stand mixer with a dough hook. While the mixer is running, add the beaten eggs and slowly pour in the eggnog. Then mix in the butter, 1 tbsp at a time, until it’s fully incorporated. Knead the dough in the stand mixer for 8 to 10 minutes. The dough should be pretty sticky, but if it's still wet and hasn't come together after kneading, add a little more flour (1 tbsb at a time). Place the dough in a bowl lightly greased with butter or oil. Cover the bowl and let it rise in a warm place until it doubles in size (60-90 minutes).
3 ½ cups bread flour, 2 ¼ tsp instant yeast, 3 tbsp sugar, 1 tsp salt, 2 eggs, beaten, 1 cup eggnog, 4 tbsp butter, butter or oil for bowl (for rising)