Separate both halves of the hoagie roll and slice each into four slices. Place them on a baking tray lined with baking paper.
Finely chop the ham, shallot, garlic, and chives.
Mix yogurt in a bowl along with the melted or softened butter. Add sour cream and season with salt, pepper, and paprika.
Add the ham, shallot, garlic, chives, and cheese to the yogurt mixture.
Top the bread slices with the mix and sprinkle additional grated cheese on top.
Bake the bread at 400F for 20 to 25 minutes, until crispy and golden brown. Garnish with chives.