In a mixer bowl combine yeast, flour, salt, and sugar.
Add in egg, water and milk and mix together. Knead for about 5-6 minutes or until dough is smooth. You may need to add in a little additional water to form a nice soft dough
Place dough into an oiled bowl and cover tightly with plastic wrap. Let rise for an hour.
Punch down dough and form 14 balls of dough. Place balls of dough onto a greased baking sheet and cover with plastic wrap and allow to rise for about 30 minutes, or until doubled in size.
Heat electric griddle to 350 degrees F. Roll out dough thinly and brush both sides with melted butter. Place dough on grill and cook for 2-3 minutes or until puffy and lightly browned. Flip and cook on other side until browned, another 2-3 minutes.
Keep cooked naan covered with a towel to keep it warm and to prevent it from drying out. Serve warm.