Apple Butter Doughnuts with Salted-Caramel Glaze

Name: Apple Butter Doughnuts with Salted-Caramel Glaze
Cook time: 2 h 45 min
Total time: 2 h 45 min
Cuisine: Thai, Asian
Ingredients: .5 cup packed light brown sugar; .5 cup granulated sugar; 2 tablespoons butter, softened; 2 large eggs; 1 tablespoon vanilla extract; 4.5 cups all-purpose flour, plus more for work surface; 2 teaspoons baking powder; 1 teaspoon baking soda; 1 teaspoon kosher salt; 1 cup Slow-Cooker Apple Butter; .5 cup whole buttermilk; Canola oil; .75 cup packed light brown sugar; 6 tablespoons butter; 3 tablespoons whole milk; 1 teaspoon vanilla extract; .25 teaspoon kosher salt; Flaky sea salt