Flemish Sugar Tart

Name: Flemish Sugar Tart
Prep time: 20 min
Total time: 20 min
Cuisine: European
Ingredients: 1/4 cup warm whole milk; 1 1/2 teaspoons active dry yeast (from one 1/4-ounce envelope); 1 1/2 cups all-purpose flour, plus more for surface; 1 tablespoon granulated sugar; 1 teaspoon cinnamon; 1/4 teaspoon salt; 1 large egg, lightly beaten; 1/2 stick unsalted butter, softened, plus more for bowl and pan; 1/2 cup heavy cream; 2 large eggs, lightly beaten; 1 1/2 teaspoons pure vanilla extract; 1 cup packed dark-brown sugar; 1/2 stick unsalted butter, melted and cooled; 1/8 teaspoon salt