Blueberry Brioche

Name: Blueberry Brioche
Cuisine: European, Mediterranean, French
Ingredients: 2 1/4 Teaspoon yeast (1 pack); 2 Tablespoon sugar; 1/4 Cup warm water; 1 1/2 Cup light brown sugar (divided); 1 Cup warm milk; 10 Tablespoon butter, softened; 3 Tablespoon golden syrup (or corn syrup); 2 eggs; 2 egg yolks (or another egg); 6 Cup flour; 1 Teaspoon salt; 2 Tablespoon vegetable oil; 1 1/2 Cup blueberries (fresh or frozen); powdered sugar (for dusting)