Triple Berry Cinnamon Swirl Bread

Name: Triple Berry Cinnamon Swirl Bread
Ingredients: 2 1/4 teaspoons active dry yeast; 1 tablespoon granulated sugar; 3/4 cup whole milk, warmed to a warm lukewarm; 1 large egg yolk; 2 tablespoons unsalted butter, melted; 2 1/4 cups King Arthur All-Purpose Flour; 1/2 teaspoon salt; a bit of olive oil for greasing the bowl; 1/4 cup unsalted butter, at room temperature; 1/4 cup granulated sugar; 3 teaspoons ground cinnamon; 2 cups fresh berries (sliced fresh strawberries, fresh raspberries, fresh blueberries); 1 large egg, beaten for egg wash