Prepare Yeast Mixture: Dissolve yeast and sugar in warm water and let sit for about 5 minutes until frothy.
Mix Wet Ingredients: In a large bowl, combine the milk, melted butter, and yeast mixture.
Add Dry Ingredients: Gradually add flour and salt to the wet ingredients, stirring until a soft dough forms.
Knead Dough: Turn the dough onto a floured surface and knead until smooth and elastic, about 5 minutes.
First Rise: Place the dough in a greased bowl, cover, and let it rise in a warm place until doubled, about 1 to 1.5 hours.
Shape Muffins: Punch down the dough, then roll out to about ½ inch thick. Cut rounds with a biscuit cutter and dust with cornmeal.
Second Rise: Place the rounds on a baking sheet, cover, and let them rise for another 30 minutes.
Cook on Griddle: Heat a griddle or skillet over medium heat. Cook the muffins for about 5-7 minutes per side until golden brown.