1. Preheat oven to 400°.
2. Combine potatoes, oil, 1/2 teaspoon salt, and 1/4 teaspoon black pepper in a large roasting pan, tossing well to coat potatoes. Arrange potatoes in a single layer, cut side down, in pan. Bake at 400° for 15 minutes or until potatoes are lightly browned.
3. While potatoes cook, peel shrimp, leaving tails intact. Devein shrimp, if desired. Set shrimp aside.
4. Stir chorizo, green beans, garlic, remaining 1/4 teaspoon salt, and remaining 1/4 teaspoon black pepper into pan. Bake at 400° for 10 minutes. Add beer, paprika, and bell pepper, scraping pan to loosen browned bits. Nestle shrimp into vegetable mixture. Bake at 400° for 10 minutes or until potatoes and green beans are tender and shrimp are done. Sprinkle with fresh parsley leaves.