Mince the garlic cloves.

Heat olive oil in a large skillet over medium heat.

Add minced garlic to the skillet and cook for 30 seconds until fragrant.

Add fresh spinach to the skillet.

Cook, tossing frequently, until spinach wilts.

Remove from heat and set aside.

Cut brie cheese into thin slices.

Divide brie slices among 4 slices of bread.

Top the brie with the spinach-garlic mixture.

Cover with remaining bread slices to form sandwiches.

Lightly butter the outside of each sandwich.

Heat a large skillet over medium-low heat.

Cook half of the sandwiches for 5-7 minutes on each side, or until golden brown and cheese melts.

Transfer cooked sandwiches to a warm oven to keep warm.

Repeat the cooking process with the remaining sandwiches.

Serve immediately.