INGREDIENTS
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3 tablespoons extra-virgin olive oil, plus more for greasing the dish
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8 ounces whole wheat bread, cut into 1/2-inch cubes
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5 ounces baby spinach, finely chopped
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1/2 cup crumbled feta cheese
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2 teaspoons Dijon mustard
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1/2 teaspoon finely grated lemon zest
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1 tablespoon fresh lemon juice
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6 large eggs, beaten
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2 cups milk
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Kosher salt and freshly ground pepper
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1 teaspoon chopped oregano