Bring a large pot of salted water to a boil. Cook pasta according to package directions. Drain, reserving one cup of the starchy pasta water. Add back to the hot pot.
While the water boils, make the dressing. In a food processor, combine the tahini, yogurt, lemon juice, garlic, anchovy paste, dijon mustard, basil, parmesan, and a pinch of salt and pepper until smooth. Taste for seasoning.
Toss the hot pasta with the dressing, thinning out the sauce with the pasta water as needed if it thickens up too much. I used about 1/4 cup, but you may need more or less.
Dry the shrimp well. In a large bowl, toss with the smoked paprika, oregano, garlic, onion powder, cayenne pepper, black pepper, and a pinch of salt.
Heat 2 tablespoons olive oil in a skillet over medium-high. Working in batches as needed, add the shrimp and sear for 2 minutes. Turn the shrimp and toss in the butter slices. Cook 2-3 minutes longer until the butter browns and the shrimp turns a rich golden color. Move to a plate.
Divide the pasta and shrimp into bowls and top with parmesan and fresh herbs, as desired.