Melt butter with oil in large heavy skillet over
medium heat. Add onion and garlic; sauté until onion is tender,
about 6 minutes. Stir in flour and cook for another 2 minutes. Gradually
whisk in stock and cream and bring to boil, whisking constantly. Cook
until mixture thickens, stirring constantly, about 2 minutes. Remove
from heat. Stir in spinach, cheese, sour cream and cayenne. Season
with salt and pepper. Serve warm with toasted baguette slices or crackers.
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