Flemish Sugar Tart

Name: Flemish Sugar Tart
Prep time: 20 min
Total time: 20 min
Cuisine: European
Ingredients: 0.25 cup warm whole milk; 1.5 teaspoons active dry yeast (from one ¼-ounce envelope); 1.5 cups all-purpose flour, plus more for surface; 1 tablespoon granulated sugar; 1 teaspoon cinnamon; 0.25 teaspoon salt; 1 large egg, lightly beaten; 0.5 stick unsalted butter, softened, plus more for bowl and pan; 0.5 cup heavy cream; 2 large eggs, lightly beaten; 1.5 teaspoons pure vanilla extract; 1 cup packed dark-brown sugar; 0.5 stick unsalted butter, melted and cooled; 0.125 teaspoon salt