Preheat oven to 400–425°F.. Place butter pieces on a parchment-lined sheet pan and place in oven until melted.
Remove pan and add shrimp, tomatoes, garlic, seasonings, and lemon slices. Toss to coat in the melted butter.
Bake 8–12 minutes, until shrimp are cooked through.
Remove lemon slices if desired. Add drained Palmini angel hair to the pan and toss with the buttery lemon garlic sauce. Add optional tablespoon of olive oil if desired.
Sprinkle with Parmesan and serve.