Season up those shrimp with a sprinkle of salt and black pepper on both sides.
Get a skillet that can handle the oven heat and heat it up over medium-high. Toss in the shrimp, but don't overcrowd the party. Give them a quick 30-40 seconds on each side for a nice sear - no steaming allowed.
Now, dial down the heat to a cozy low-medium. Let the onions hang out in the skillet for 5-7 minutes until they're doing that golden, translucent, and soft thing. Toss in the garlic for a quick mingle.
Time to amp up the flavor! Throw in those tomatoes, a dash of sugar, some crushed red pepper flakes, black pepper, and just a pinch of salt. Remember, the feta brings its own salty game, so don't go overboard with the salt.
I'm all about the canned tomatoes - quick blender blitz to save time. If you're rolling with crushed canned tomatoes, skip the blending step.
Lid up that pan and let the sauce work its magic- reduce and thicken for about 6-7 minutes. Toss in the scallions, the shrimp, and crumble in that feta.
If your pan can handle the heat, pop it under the broiler for a cool 5 minutes. Wait for that cheese to melt, the sauce to get bubbly, and maybe a hint of char for extra flavor.
Top it off with a sprinkle of chopped parsley and some lemon wedges.
Grab some crusty, toasted bread or toss it over pasta. It is your call.