Heat oven to 350 degrees. Squeeze spinach of all excess liquid. Set aside. Heat oil in a large skillet over medium heat. Add shallots; cook, stirring, until soft, about 3 minutes. Add garlic; cook 1 minute more. Add spinach, tomatoes, salt, pepper, and pepper flakes. Cook, stirring 2 minutes more. Remove from heat; let cool about 15 minutes. Add ricotta; stir to combine. Season with salt and pepper.
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