"Delicious Strata with Challah, Spinach, Gruyere recipe - perfect for brunch or dinner. Easy prep, make-ahead, full of flavor...."
INGREDIENTS
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4 cups challah bread (cut into 1-inch cubes)
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1 tablespoon olive oil
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1 medium onion (chopped)
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1 medium red bell pepper (chopped)
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2 cups fresh spinach (roughly chopped)
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1½ cup Gruyere cheese (grated)
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6 large eggs
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2 cups milk
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½ teaspoon salt
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¼ teaspoon black pepper
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¼ teaspoon ground mustard