Prepare the taco chicken following the linked Taco Chicken recipe; keep warm.
Prepare the corn: for grilled corn, brush husked ears with 1 tablespoon olive oil and lightly season.
Grill the corn at 400°F, turning every 3 minutes, until lightly charred, about 12 minutes; cool and cut kernels off the cob.
Or cook stovetop: heat 2 tablespoons butter or 1 tablespoon olive oil in a skillet, add corn (use frozen or canned if preferred) and cook, stirring occasionally, until browned, about 10 minutes; season and cool.
In a large bowl, combine the cooled corn, lime juice, remaining 1 tablespoon olive oil (if using), diced avocado, finely diced red onion, diced red bell pepper, chopped cilantro, minced garlic, ground cumin, and red pepper flakes if using.
Season the salsa with salt and pepper to taste (about 1/4 teaspoon each suggested) and gently toss to combine.
Spoon the avocado-corn salsa over the prepared taco chicken and serve with rice if desired.