Peel and dice the Yukon Gold potatoes into small cubes.
In a skillet over medium heat, brown the ground beef until fully cooked. Drain excess fat.
Add the browned beef and cubed potatoes to the slow cooker.
Pour in the mixed vegetables, corn, tomato soup, diced tomatoes, and green beans (including the liquids).
Season with salt, pepper, and sugar.
Stir everything together until well combined.
Cover and cook on low heat for 2–3 hours or until potatoes are tender.
Taste and adjust seasonings before serving.