Combine the 8 oz cream cheese, 1/2 cup sour cream, 1 1/2 cups cheddar cheese, 4 strips of chopped bacon, and 2 ½ tbsp chives in a bowl.
Slice bread loaf in half lengthwise.
Spread a thick layer of the cheese mixture onto each bread half. (It may be easiest to do this with a rigid rubber spatula or the back of a large spoon.)
Bake at 350F for 15-20 minutes until the cheese mixture is melted through. For extra toasty cheesiness, broil for 1-2 minutes, then remove from the oven.
While the bread is still hot, crush some potato chips over the top. Some may bounce off, but most should stick to the warm cheese.
Slice the bread into thick slices and top each with a dollop of extra sour cream and the rest of the chives.