French toast casserole with Tomatoes, Pesto, Bocconcini, and Balsamic Sauce

Ingredients

• 2 tbsp melted butter
• 4 beaten eggs
• 1 cup of milk
• ¼ cup pesto
• 10 slices of 9-grain loaf bread from Boulangerie St-Méthode, cut into cubes
• 4 bocconcini cheese balls, sliced
• 2 tbsp balsamic glaze
• 2 tbsp maple syrup
• ¼ cup butter
• 1 large yellow onion, sliced
• 1 can (551 ml) cherry tomatoes