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Line large baking sheet with parchment or silicone liner. In a small dish, combine seasonings: 1/2 tsp cumin, 1/2 tsp cayenne pepper, 1 tsp salt and 1/4 tsp black pepper and evenly sprinkle seasoning mix over both sides of tilapia.
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Lightly drizzle fish with olive oil and dot each piece with butter. Bake at 375 for 20-25 min. To brown edges, broil for 3-5 minutes at the end if desired.
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Combine all taco sauce ingredients in a medium bowl and whisk until well blended.
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To serve the tacos, toast quickly toast the corn tortillas on a large dry skillet or griddle over medium/high heat.
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To assemble: start with pieces of fish then add remaining ingredients finishing with a generous sprinkle of cheese and finally the taco sauce. Serve with a fresh lime wedge to squeeze over tacos.