Saute garlic and spinach: Heat 1 tsp butter in large non-stick skillet over medium heat. Add garlic and saute until lightly golden and fragrant, about 30 - 60 seconds. Add in spinach and artichokes, season with salt and saute until the spinach wilts.
Remove excess moisture from spinach: Transfer mixture to several layers of paper towels. Once it's cool enough to handle wrap with paper towels and squeeze excess moisture from the spinach and artichokes.
Assemble sandwiches: butter the outsides of all the slices of bread**. Then on the non-buttered side of 3 slices of bread layer half the cheese, then layer with the spinach artichoke mixture, dollop tiny spoonfuls of the sour cream over the spinach artichoke layer, then sprinkle remaining cheese over then top each with the remaining slices of bread (buttered side up).
Cook sandwiches in skillet: Wipe skillet clean then heat over medium-low heat. Add as many sandwiches as you can fit (or just use two skillets). Cover with lid and cook until bottom of sandwiches are golden brown then carefully flip, cover and cook opposite side until golden brown.
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