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Preheat oven to 400°F.
Add olive oil to an oven-safe, 14- to 16-inch nonstick skillet over medium-high heat and heat to very hot. Add cherry tomatoes and brown them on all sides, about 3-4 minutes. Add in red onion and cook for another 1-2 minutes. Add in spinach, season with salt and pepper, and stir to combine.