Croissant Breakfast Casserole

Name: Croissant Breakfast Casserole
Ingredients: 8 large bakery croissants (, cubed into 1-inch pieces); 3 Tablespoons salted butter (, melted); 12 ounces cream cheese (, softened *see note); 3/4 cup granulated sugar; 5 large eggs (, at room temperature); 3/4 cup heavy cream (, at room temperature); 3/4 cup whole milk (, at room temperature); 1 teaspoon almond extract; 1/4 teaspoon fine sea salt; 1 Tablespoon orange juice; 1 1/2 teaspoons orange zest; 1 pint fresh blueberries (, divided); 1/2 pint fresh raspberries (, divided); 1 cup powdered sugar; 1/2 teaspoon almond extract; 1-2 Tablespoons heavy cream; Sliced almonds (, optional)