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Preheat the oven to 400°F.
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In a baking dish, add cherry tomatoes, rosemary, garlic, onion, feta, extra virgin olive oil, salt, black pepper, and red pepper flakes. Using your hands, mix to coat with seasonings.
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Place in the oven and bake for 30-40 minutes, until tomatoes have burst and the feta is golden brown.
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As it bakes, cook your pasta according to the package instructions. Drain water, retaining about 1/2 cup of pasta water.
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Remove from the oven and add torn basil leaves. Using a spoon, combine into a sauce, adding a splash of reserved pasta water as needed.
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Add pasta and stir until combined.
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Serve warm and enjoy!