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Cook macaroni until very firm. According to the box instructions. Macaroni should be too firm to eat. Drain. Set aside.
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In a large pot, melt butter and add onion. Cook for 2 minutes until soft but not brown. Add Thyme.
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Pour in milk, add mustard, sour cream and combine. Reduce heat to low.
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Add in cheese and stir until melted.
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Add salt and pepper. Taste sauce and add more salt as needed. Do not under-salt, by the time you add pasta it will even out the salt flavor. Remember no one like bland pasta!
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Pour in drained, cooked macaroni and stir to combine. Add spinach and combine.
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Top with extra cheese, and bake for 20 minutes or until bubbly on top. Enjoy!