Place the shrimp, 1 tablespoon of olive oil, dried oregano, lemon juice, minced garlic, and a pinch of salt and pepper into a 5-quart Dutch oven or pot. Simmer over medium-low heat, stirring often, until the shrimp are almost cooked through. Remove the shrimp from the pan and set aside.
Start the pasts while the shrimp is cooking. Bring a large pot of salted water to a boil. Cook the pasta according to the package directions until al dente. Drain the water and set aside.
Pasta
Add 1 tablespoon of olive oil, onions, and garlic to the same pot. Simmer over medium heat until the onions are translucent, about 5 minutes.
Preheat your oven to broil on high. Place the tomatoes on a baking sheet and spray lightly with olive oil cooking spray (or toss in 1 tablespoon olive oil). Cook on the center rack until roasted, about 3-4 minutes. Transfer to a bowl and set aside.
Add the zucchini, bell pepper, oregano, garlic, and vegetable stock to the pot. Simmer for 5 minutes.
Whisk together the heavy cream and all-purpose flour in a medium bowl together until combined. Pour the cream into the pot and stir to combine. Cook for 2 minutes or until the sauce begins to thicken. Season with salt and pepper to taste.
Mix the cooked pasta and the shrimp into the sauce and cook for 2 more minutes until the shrimp is warmed through.
Top the pasta with the roasted cherry tomatoes, artisan olives, and crumbled feta cheese. Serve warm.