Season salmon with salt, pepper, onion powder and garlic powder. Melt 1 tablespoon butter in a skillet with 1 tablespoon of olive oil. Sauté salmon flesh side first about 4-5 min. Turn over and sauté skin side approx 3-4 min. Drain on paper towels
To make aioli mix all ingredients together and season to taste w/ salt & pepper. Set aside. You can make this ahead and store in fridge.
To assemble: toast buns spread each side with aioli. Stack lettuce tomato onion and bacon. Place a salmon filet on each stack. Top with remaining bun. Cut in half and enjoy.