01 -
Set oven to 175°C. Lightly grease a 33x23 cm baking dish.
02 -
Place cubed potatoes in a large pot with salted water. Bring to a boil and simmer until fork-tender, about 7–10 minutes. Drain thoroughly and arrange evenly in the prepared baking dish.
03 -
While potatoes cook, heat olive oil in a large skillet over medium-high heat. Add sliced kielbasa and cook until browned and caramelized, about 5–7 minutes. Distribute the sausage over the potatoes.
04 -
In the same skillet, melt butter over medium heat. Whisk in flour to form a roux and cook for 2 minutes, stirring constantly.
05 -
Add minced garlic and cook 30 seconds. Gradually whisk in milk and heavy cream until smooth. Stir in cumin, garlic powder, salt, pepper, and cheddar cheese soup. Cook, whisking frequently, until thickened, 3–4 minutes. Remove from heat and incorporate 150 g shredded cheddar until the sauce is smooth.
06 -
Pour the cheese sauce evenly over the potatoes and kielbasa. Sprinkle the remaining 50 g cheddar cheese on top.
07 -
Bake uncovered for 30 minutes, until the sauce is bubbling and top is golden. Rest for 10 minutes before serving to allow the sauce to set.