French Toast with Caramelized Bananas

INGREDIENTS

• 6 eggs
• 1 cup half-and-half or whole milk
• 1 Tbs. granulated sugar
• 1 tsp. vanilla extract
• Finely grated zest of 1 large orange
• 1/8 tsp. freshly grated nutmeg
• 6 slices day-old challah or other egg bread
• Canola oil for cooking
• 3 firm but ripe bananas
• 2 Tbs. unsalted butter
• 3 Tbs. firmly packed light brown sugar
• 1/2 cup fresh orange juice, plus more, as needed
• 2 Tbs. dark rum (optional)