Preheat oven to 400º.
Peel and devein the shrimp if you want. Heat olive oil in a pan. On my stove I set it to about 70% power and sauté the shrimp until they turn pinkish-white, and curl up, then remove them from the pan and set aside.
Next, wash your pan, and add the butter. I set the heat just below medium, and add your minced garlic. For this dish I like to use a garlic press, but dice it by hand if you prefer.
Let it cook for about 6 minutes until the garlic becomes aromatic. The goal here is two-fold. Cook the garlic enough to get rid of the raw flavor, and to infuse the butter with the garlic.
Add the cooked shrimp to the garlic butter, stir to coat well, and turn off the heat.
Then, spritz the flatbread with some olive oil, or drizzle a little by hand. Spread the mozzarella cheese over the bread, and then try to evenly distribute the shrimp and garlic butter over your bread. Bake the bread until the cheese is melted - about 6 minutes
Garnish with red chili flakes and sliced scallion greens.