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In a sauté pan over medium-low heat, add olive oil and onions.
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Cook until soft then add the garlic.
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Cook until garlic just starts to become golden, then add wine and reduce to a syrup.
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Next, add butter to the onions. Once butter is melted, stir in flour and continue to stir until completely incorporated. It will thicken up quite a bit.
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Add milk/half and half a little at a time while whisking constantly. It will seize up at first, this is ok.
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Add cheddar cheese a little at at time making sure to let it melt before adding more.
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When all the cheese is added and the sauce is smooth, add the spices and stir.