Strata Recipe - Jo Cooks

Ingredients

• 4 cups challah bread (cut into 1-inch cubes)
• 1 tablespoon olive oil
• 1 medium onion (chopped)
• 1 medium red bell pepper (chopped)
• 2 cups fresh spinach (roughly chopped)
• 1½ cup Gruyere cheese (grated)
• 6 large eggs
• 2 cups milk
• ½ teaspoon salt
• ¼ teaspoon black pepper
• ¼ teaspoon ground mustard