Heat olive oil in a non stick skillet over medium.

Add garlic and cook for a few minutes.

Sprinkle shrimp with salt, pepper, cumin and red pepper flakes if using.

Cook shrimp for about 8 minutes until pink on both sides and cooked through. Don't crowd shrimp in pan. May need to do it in two batches. Smaller shrimp will take less time.

Toss with cilantro and squeeze lime juice over the top.

Serve with guacamole.