Burnt Caramel And Sea Salt Sticky Buns Recipe

Name: Burnt Caramel And Sea Salt Sticky Buns Recipe
Ingredients: 1 package (2 1/4 teaspoons) active dry yeast; 1/2 cup warm water (about 100 degrees F); 1/3 cup granulated sugar; 1/4 cup unsalted butter; 1/2 cup sour cream; 1/2 cup milk; 1 tablespoon pure vanilla extract; 1 teaspoon fine sea salt; 1 egg; 4 cups all purpose flour; 1 1/2 cups granulated sugar; 1/4 cup water; 1/2 cup heavy cream; 1/4 cup butter; 1 1/2 cups Demerara or dark brown sugar; 1 1/2 tablespoons ground cinnamon; 1 cup chopped walnuts; flaky sea salt (such as Maldon)