Remove skin from fillet. Cut fish into bite sized 1 inch cubes.
In a medium sized bowl, combine flour, cumin, chili powder, and salt. Dredge halibut pieces in the flour mixture to fully coat.
Heat oil in a large heavy bottom skillet over medium high heat. Ensure the oil is hot by adding a pinch of flour - if it bubbles immediately, the oil is ready.
Place the halibut in the hot oil. Do not crowd the individual pieces and plan on cooking the fish in two batches, depending on the size of your fillet. Cook each side until golden brown, about 2 minutes per side. Gently turn with tongs. Once fully cooked, transfer fish to a paper towel lined plate.
Once all of the fish has cooked, you can cook your tortillas in the hot oil. Stacked in pairs, cook the bottom tortilla in the oil. After about 15 seconds, flip both tortillas and turn the top tortilla over so the uncooked side in on the outside. Continue to flip and turn until both sides of each tortilla have cooked in the oil. Set the warm tortillas on a paper towel to drain.
To serve, put 3-4 pieces of fish in a tortilla and top with creamy cilantro lime slaw, salsa, sour cream, and/or a squeeze of lime.