Peel and chop the potatoes into 0.5-inch pieces. Place in a microwave-safe bowl, sprinkle with 0.5 teaspoon salt and 0.25 teaspoon black pepper. Microwave for 4 minutes, then stir and microwave for an additional 2-4 minutes until fork-tender.

While potatoes cook, heat 1 tablespoon oil in a large skillet over medium-high heat. Add chopped onions and sauté until lightly browned, about 3 minutes. Add minced garlic and sliced kielbasa, cook for 3 minutes while stirring.

Add cooked potatoes to the skillet, toss to coat, and spread across the pan. Cook for 2-3 minutes until lightly browned, stirring occasionally.

Add sliced cabbage to the skillet, sprinkle with 0.25 teaspoon salt and 0.25 teaspoon black pepper. Add 2 tablespoons water, reduce heat to medium-low, cover and cook for 2 minutes until cabbage is bright green and barely wilted. Taste and adjust seasoning as needed.