Blueberry Croissant French Toast

Ingredients

• 2 Cups fresh or frozen blueberries
• 3 eggs
• 1 cup milk
• 1 teaspoon sugar
• 1 teaspoon vanilla extract
• 1/4 teaspoon salt
• 4 medium or 8 small croissants sliced lengthwise
• 3 tablespoons unsalted butter divided
• 1 tablespoon canola oil
• 3 heaping tablespoons brown sugar
• 1/3 cup maple syrup