Blueberry And Ricotta Stuffed French Toast Breakfast Sandwiches

Name: Blueberry And Ricotta Stuffed French Toast Breakfast Sandwiches
Ingredients: 8 slices Texas toast (thickly sliced challah bread works well too); 6 large eggs; 1 1/2 cup whole or low-fat milk; 3/4 tsp ground cinnamon; 1 1/2 tsp pure vanilla extract; zest of 1 large orange (about 3-4 teaspoons); butter for griddle; confectioners sugar for dusting; 3/4 cup whole or part-skim milk ricotta cheese; 1 tsp orange zest; 2 tsp Cointreau or Grand Marnier (orange liqueur); 4 tsp sugar; 1 cup fresh blueberries