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Preheat oven to 450.
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Brown the ground beef with the diced onion until the meat is fully cooked; drain the grease and then return the beef and onion back to the pan.
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Add the drained/rinsed black beans, the salsa and the taco seasoning, stirring to combine.
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Simmer until the liquid (from the salsa) has reduced slightly, thickening the mixture.
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Now scoop some meat and bean mixture into each tortilla (you can add cheese now if you want. I add some before baking and then sprinkle more on the outside after) and fold them up like an envelope so that all the filling stays in.
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Melt your butter and then brush on the entire outside of the tortilla envelopes.
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Bake for 10-20 minutes, until crispy and light brown.
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Top with more cheese, sour cream, salsa, tomatoes, etc.