King Bundt Cake

Name: King Bundt Cake
Prep time: 15 min
Cook time: 1 h
Total time: 1 h 15 min
Cuisine: American
Ingredients: 1 ⅓ cup (5.333 oz150 g) powdered sugar; 2 tablespoons heavy cream; 1 teaspoon vanilla extract; Purple, yellow, and green sugar sprinkles; 1 lb (452 g) unsalted butter, room temperature; 2 cups (14 oz/ 296 g) sugar; 5 large eggs, room temperature; 2 1/2 cups (10.5 oz/298 g) all-purpose flour; 1 tablespoon cornstarch; 1 teaspoon baking powder; 1/2 teaspoon kosher salt; 1 cup (8 oz/227 g) sour cream; 1/4 cup (1.75 oz/50 g) sugar; 1 tablespoon cinnamon