Add butter and buttermilk in a microwave safe bowl and microwave for 1 minute. Whisk in ricotta cheese. Continue to heat in microwave until mixture is 120-130°F.
Add mixture to a stand mixer bowl. Add flour, sugar, salt and yeast. Mix together with a paddle attachment on low until combined. Use dough hook to knead at medium speed about 2 minutes or until dough pulls away from the sides of the bowl and forms a ball.
Place in a well-oiled bowl and cover with a damp flour sack towel or plastic wrap. Set aside in a warm place to rise until doubled, about an hour.
Punch down dough and roll out onto a lightly floured surface. Using a 2-inch biscuit cutter, cut dough into rolls and place in a well-oiled 10-inch cast iron skillet. Cover and allow to rise about 30 minutes to 1 hour.
Bake at 350°F for 23-25 minutes or until rolls are browned.
Brush with melted butter and serve immediately.