Cut the kernels off the cob. Add to a heavy bottom skillet over high heat. Cook until most of the kernels have browned. Stir occasionally. 6 to 8 minutes. (You can also Grill the ears of corn over a grill or gas flame until grilled to preference. Shuck the grilled corn and toss with the spices.)
Add the spices to the roasting corn pan and mix well to coat. Cook for a minute or until the spices start to smell roasted.
Prep the toast:
Toast bread of choice lightly. Add a layer of mashed avocado on the bread. Layer with the smoky roasted corn. Sprinkle chopped onion, coriander and lime juice and a pinch of salt.