Best Ever Cinnamon Rolls Ingredients 2/3 cup whole milk 1/4 cup butter, cold and diced into cubes 1/2 cup buttermilk 1/4 cup vegetable oil 2 1/4 tsp active dry yeast 1/2 cup granulated sugar 1 1/4 tsp salt 2 tsp vanilla extract 1 large egg, at room temperature 1 large egg yolk, at room