In a large skillet, heat olive oil over medium heat.  Add the garlic and cook, stirring constantly, for 30 seconds. Add the broccoli and the black pepper to the pan and stir to combine, cooking for another 3 minutes. Add half and half and cheese and stir to combine. Add shrimp, placing them on top of the broccoli mixture and cook until they are no longer translucent and pink on both sides, about 5 to 7 minutes. Do not overcook.  Top with crushed red pepper flakes, if desired.