Simmer corn cobs, cream, broth, garlic, thyme, bay leaf, and half the onions.
Remove cobs and bay leaf, then blend solids into the broth.
Cook sausage until browned, slice, and set aside.
In bacon fat, sauté jalapeños, cumin, and remaining onions.
Add corn stock (reserve ½ cup), potatoes, and sausage. Boil, cover, and cook 25 minutes.
Whisk flour into reserved stock, stir into soup, and simmer until thickened.
Add corn kernels and cook 5 minutes until tender.
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