Cut sweet potatoes in 1/2-inch cubes (try to keep them around the same size); slice bell peppers into long strips then cut them into 1-2 inch long strips; slice kielbasa.
Heat olive oil on a cast iron or regular skillet under medium/medium low heat. When oil is heated, add kielbasa and cook for 2-3 minutes. Stir occasionally. Remove kielbasa from skillet.
Add more olive oil to skillet if skillet is no longer greasy. Add sweet potatoes and cook for 9-11 minutes, or until sweet potatoes are tender when pierced with a fork. Stir occasionally to ensure all sides are cooked.
Add bell peppers to skillet, stir and cook for 2 minutes.
Add corn to skillet, stir and cook for 1 minute. Add salt and pepper to taste, garlic powder, and onion powder.
Add kielbasa back to the skillet, stir and cook for another minute.
Remove from heat. Garnish with chopped green onions. Serve and enjoy!