"A caramelized onion, spinach, and feta breakfast casserole. This Savory french toast casserole is easy to make ahead and pop it in the fridge. It's great to serve for brunch but also yummy with a side salad for dinner!..."
INGREDIENTS
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3/4 loaf (day old) french bread, diced
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2 medium onions, halved and thinly sliced
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2 tablespoons butter, divided
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1 tablespoon oil
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1/2 teaspoon fresh thyme (or 1/4 dried)
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1 tablespoon granulated sugar
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1/2 tablespoon balsamic vinegar
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2 teaspoons minced garlic
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4 ounces fresh baby spinach, roughly chopped
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1 1/4 cup milk (I swapped out 1/4 cup for heavy cream)
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8 eggs
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4 ounces crumbled feta cheese
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1 1/2 cup shredded cheese*