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Heat the butter and oil in a large pot or pan with deep sides over medium high heat. Add the onion with a pinch of salt and stir. Cook for 5 minutes, stirring occasionally.
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Add the garlic and stir in, cooking for another 2 minutes.
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Add the bell peppers, zucchini and yellow squash with a pinch of salt. Stir.
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Add the cumin and ancho powder. Stir and cook for 1-2 minutes, until the spices are fragrant.
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Add the drained juice only from the tomatoes, as well as the cider vinegar. Stir and bring to a boil.
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Place a lid on the pan and reduce the heat to maintain a gentle simmer. Let the vegetables steam cook this way for 5 minutes (I used the thickest noodle setting on my spiralizer--if your noodles are thinner or if you like crisper zucchini, steam for shorter time or skip step completely).
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Remove the lid and raise the heat until the liquid comes to a brisk simmer. Let the liquid evaporate a bit for 5 minutes, stirring if needed.
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The zucchini should be tender at this point--if not (and if you want them more tender), cook a while longer.
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When the zucchini is cooked, add the cream cheese, whipping cream, Salsa Negra and shredded Monterey Jack cheese. Stir constantly to melt the cheeses, and as soon as that occurs, stir in the chopped tomatoes and remove the pan from the heat. Taste for additional salt.
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Serve, topped with protein if desired (see headnote), and garnished with chopped cilantro, shredded cheese and more Salsa Negra if desired.