Preheat the oven to 350°F.
Add the bacon to a skillet over medium heat. Cook for about 5-7 minutes, until crisp, then remove the bacon from the pan and drain off the excess fat.
Heat 1 teaspoon olive oil in a large sauté pan over medium-high heat. When hot, add the onion, peppers, and garlic. Cook, stirring occasionally, for 5 to 6 minutes, until the vegetables are wilted and slightly browned.
In a large bowl, stir together the onion and bell pepper mixture, corn, kale, chicken, mayo, salt, and pepper until combined.
Transfer the chicken mixture to a 3-quart (9x13) rectangular casserole dish, then top with the cheddar cheese and bacon.
Bake for 30 minutes, until the top of the casserole has browned.
After removing the casserole from the oven, let it cool slightly, then garnish with green onions and serve!