Morning Buns | America's Test Kitchen

Ingredients

• 3 cups (15 ounces/425 grams) all-purpose flour
• 1 tablespoon sugar
• 2 1/4 teaspoons instant or rapid-rise yeast
• 3/4 teaspoon salt
• 24 tablespoons unsalted butter, cut into 1/4-inch-thick slices and chilled
• 1 cup sour cream, chilled
• 1/4 cup orange juice, chilled
• 3 tablespoons ice water
• 1 large egg yolk
• 1/2 cup (3½ ounces/99 grams) granulated sugar
• 1/2 cup packed (3½ ounces/99 grams) light brown sugar
• 1 tablespoon grated orange zest
• 2 teaspoons ground cinnamon
• 1 teaspoon vanilla extract