Take chicken and place it in a slow cooker with hot sauce and half of butter. Cook on high for 5 hours.
Place rest of Butter and garlic in a microwave safe dish and melt slowly,a few seconds at a time till all of it is melted. Brush onto both sides of bread.
Place bread into a well oiled skillet on med-high heat. Brown both sides ten reduce heat.Place a small amt of the chicken and spinach on it and put the lid on till the spinach is slightly wilted (only slightly).
Then place a small amt of cheese onto the top of the crostini and put lid on again till cheese is melted. Do this until you have no ingredients left. Enjoy!