Pan de leche(sweet rolls)

Pan de leche(sweet rolls)
1 cup warm milk
1/4 cup unsalted butter, melted
1 large egg
2 teaspoons instant yeast
3¼ cups all-purpose flour
1/4 cup white sugar ( can add up to 1/2c. for sweeter rolls)
1 teaspoon salt
1 egg +2 tbsps milk to brush on rolls before baking
vegetable oil for coating the bowl
3 tbsps melted butter to top rolls