Heat oil in a deep skillet over medium.
Add flour cooking about 4 mins-don't brown it, just whisk it.
Add garlic and cook a few second.
Slowly add the milk, 1/2c. at a time whisking constantly to make smooth.
Reduce heat to medium-low and add cheese. Stir in salt/pepper. soon as it is almost melted, remove pan from heat and let cool a bit.
Stir in the spinach and artichokes.
Add the reserved fresh garlic cloves.
At this point you need to let it cool before putting on the pizza. I like to make this ahead of time then store in fridge. I spread it on the pizza while it is cold.