Preheat oven to 375°F; spray two 12-cup muffin pans with cooking spray.
In a skillet, warm olive oil over medium-high heat; reduce heat to medium-low and add onion, garlic, and jalapeno. Sauté, stirring occasionally, until soft and translucent, about 10 minutes.
In a bowl, combine breadcrumbs, Splenda Sweetener, cumin, chili powder, salt, pepper, and cayenne.
Add sautéed vegetables and stir. Add corn, green chilies, egg, lime juice, and cilantro; stir to combine.
Divide batter among prepared muffin pans, pressing evenly into each cup.
Bake for 25 minutes. Garnish with a small slice of avocado (if desired).