Remove thick slices brioche bread from bag and peel away any paper, if applicable. Set aside. (The Trader Joe's brioche bread has paper you need to peel from each slice.)
Preheat large, nonstick skillet over medium low to medium heat.
In a large, shallow dish, whisk milk, eggs, cinnamon and vanilla together until well combined.
Melt 1 tablespoon butter onto pan. Soak two slices of brioche bread in egg and milk mixture, 3 seconds per side, and transfer directly to hot pan. Fry each side 30 seconds to 1 minute or until evenly golden in color. Remove from pan to a baking sheet. Keep cooked brioche french toast pieces warm in a 200 degree oven.
Continue this method until all slices of brioche bread have been fried.
Serve warm brioche french toast with powdered sugar, strawberries, whipped cream, maple syrup or any other desired toppings.