01 -
Preheat the oven to 175°C. Lightly coat a 22x33 cm baking dish with nonstick spray.
02 -
Boil cubed russet potatoes in salted water until tender, approximately 7 minutes. Drain well and transfer to the prepared baking dish.
03 -
Heat olive oil in a skillet over medium heat. Sauté sliced kielbasa until deeply browned, about 5 minutes, then arrange over the potatoes.
04 -
In the same skillet, melt unsalted butter and whisk in all-purpose flour. Cook, stirring constantly, until the mixture forms a pale roux.
05 -
Stir in minced garlic, then gradually pour in the 2% milk and heavy cream. Flavor with ground cumin, garlic powder, salt, and cracked black pepper. Add cheddar cheese soup, whisking until mixture thickens, about 3-4 minutes.
06 -
Remove skillet from heat and fold in shredded sharp cheddar cheese until melted and smooth.
07 -
Pour cheese sauce evenly over the potato and kielbasa mixture in the baking dish. Bake for 30 minutes, or until the surface is golden and bubbling.