This dinner shows that simple is best. A few simple spices add a lot of flavor to mahi mahi or hearty portobello mushrooms. Topped with fresh tomatoes and sweet corn, these will satisfy any appetite.
Brush or spray a sheet pan with some cooking oil. Mix together coriander, cumin, garlic powder, paprika, salt, and oil. Toss sliced mahi mahi in spice mixture and spread out into 1 layer on a sheet pan. Roast for 8 to 12 minutes, until fish is golden on the outside and opaque in the middle.
Microwave corn for ~1 minute until unfrozen. Toss corn, shallots, tomatoes, and cilantro with paprika and red wine vinegar.
Warm up tortillas according to package instructions.