Prepare Basic Sweet Dough recipe: Using a whisk or fork, mix 4 1/2 cups flour, salt, and sugar in a large bowl. Add instant yeast and mix again. Rub or cut in butter into the dry ingredients until incorporated. Mix milk and eggs in another bowl. Pour into flour mixture. Mix until the dough comes together. If the mixture is sticky, add a little more flour. Transfer dough to a clean, floured work surface and knead for 10 to 12 minutes or until dough becomes smooth and elastic.
Perform the windowpane test: Gently stretch a small piece of dough; if it breaks, continue kneading. The dough is ready when you can stretch it into a thin film without it breaking.