01 -
Preheat oven to 375°F. Butter a 9x13 inch baking dish using 1 tablespoon of unsalted butter. Set aside.
02 -
Melt remaining 4 tablespoons butter in a small saucepan over medium heat. Add cream cheese, seasoned salt, and black pepper. Whisk continuously until smooth and no lumps remain.
03 -
Whisk in half & half until fully combined and the sauce thickens. Remove from heat and let cool before combining with potatoes.
04 -
Place peeled potatoes in a large pot and cover with water by 2 inches. Bring to a boil over high heat, then reduce to medium and cook until potatoes are tender but not falling apart, about 15-25 minutes depending on size.
05 -
Add broccoli florets to boiling potatoes during last 2 minutes of cooking. Remove broccoli with a slotted spoon and set aside to retain bright color and slightly cook.
06 -
Drain potatoes in a colander and allow to cool slightly until manageable. Roughly chop into bite-sized pieces and return to the pot to let excess moisture evaporate.
07 -
Add cooled cheese sauce and sour cream to the chopped potatoes. Stir gently to coat evenly.
08 -
Gently fold broccoli florets into the potato mixture. Transfer everything evenly into the prepared baking dish.
09 -
Sprinkle shredded Colby-Jack cheese evenly over the casserole.
10 -
Bake uncovered for 25-30 minutes, or until the cheese is melted and the sauce is bubbly.
11 -
Allow casserole to cool on the counter for 5 minutes to let the sauce set before serving.