Making a really good quesadilla is a life skill that everyone should have. This recipe is simple—seasoned ground beef + melty Monterey jack + avocado—and almost every element can be substituted or skipped. INGREDIENTS vegetable oil 1 tbsp.  onion, finely chopped1 lb.  ground beef1/2 tsp.  ground chili powder1/2 tsp.  ground paprika1/2 tsp.  ground cumin Kosher salt Freshly...
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