Make avocado cilantro sauce. Blend together avocado with cilantro, juice of ½ lime, yogurt, and water until smooth. Season with salt and pepper.
Make corn fritter batter. Combine corn with cotija, chili powder, scallions, egg, flour, milk, baking powder, salt, and black pepper until well combined.
Heat 2 tablespoons oil in a large saute pan over medium heat. Scoop ¼ cup of corn mix into hot oil to make a fritter. Repeat with remaining batter, cooking until golden brown on both sides.
Serve Mexican corn fritters with avocado cilantro sauce and garnish with cotija and cilantro.
Notes
The avocado cilantro sauce can be prepared up to 3 days in advance.