Place a large pot over medium heat and add the olive oil. When the oil is hot, add the onion and saute until the onion is soft and translucent. (About 3-4 minutes). Add the chorizo to the pan and continue to saute for another 3 minutes until enough fat has released to coat all the onion.
Next, add the garlic and paprika to the pot. Stir and saute for another minute until aromatic.
Pour the white wine into the pot. Bring to the boil and add the clams to the pot. Distribute the clams evenly across the pot. Cover with a lid and cook for 6-7 minutes until the clams have opened up. Discard any that do not open.
Remove the pot from heat and stir in the parsley and butter. Season with salt and pepper and serve in hot bowls with crusty bread.