Blueberry Cinnamon Rolls

Name: Blueberry Cinnamon Rolls
Prep time: 30 min
Cook time: 28 min
Total time: 58 min
Cuisine: American
Ingredients: 1/2 cup packed light brown sugar (100g); 1 tsp cornstarch (2g); 1 tsp ground cinnamon (2g); 1/4 tsp salt (2g); 1/2 cup unsalted butter, softened (113g); 1 cup blueberry jam (300g); 4 1/4 cups all-purpose flour + about 1/2 cup (550g-615g); 4 1/2 tsp or 2 packets instant dry yeast (14g, 1/2 oz.); 1 tsp salt (6g); 1 cup whole milk (240ml); 1/2 cup unsalted butter (113g); 1/2 cup sugar (100g); 2 large eggs, room temperature (112g); 1/2 cup unsalted butter, room temperature (113g); 2 tsp vanilla extract (8g); 1/4 tsp salt (1g); 1 1/2 cups powdered sugar (190g); 3 Tbsp whole milk (45ml); 3 Tbsp blueberry jam (55g); 1/2 cup fresh blueberries, to garnish (95g)