Start by putting together the mango slaw in a medium-sized mixing bowl. Gently toss all ingredients together to combine. If you want extra heat in your dish, add a finely chopped serrano or jalapeño pepper (remove seeds to turn down the spice). Refrigerate until you’re ready to assemble your tacos.
For the chipotle mayo, combine mayonnaise, yogurt and chopped chipotles (with adobo) together. If you’re using whole chipotles and don’t want any chipotle chunks, you can just buzz this together with an immersion blender. Season with salt and pepper. Refrigerate until ready to serve.
Preheat oven to 425 F.
In a medium skillet, toast the sesame seeds and Panko bread crumbs over medium heat until light golden brown. Remove from heat and let come to room temperature.
Divide the fish filets in two, longways.
Dry each side of the fish well with paper towel. Season generously with salt and pepper.
Slather one side of the fish with an even layer of mayonnaise. Be generous but you don’t need gobs of mayo. Sprinkle half of the Panko/ sesame seed mixture over this first side of the fish, lightly patting it in. Flip once and repeat on side two
Place the coated fish pieces on top of a wire-rack lined baking sheet. Bake at 425 F for 3 minutes. Flip the fish and bake for another 3 minutes.
To plate, add a dollop of chipotle mayo to a warm corn tortilla, top with the fish, then the mango slaw, and garnish with a sprinkling of cilantro and a wedge of lime.