Prepare rice mix as directed on package. Preheat a large saute pan over medium-high heat and add the olive oil. Add onion, peppers, garlic and sausage. Cook ingredients until slightly caramelized, about 4 minutes. Add shrimp, clams and seasoning blend. Stir ingredients and cover. Cook ingredients until shrimp are almost cooked throughout and clams have started to open, about 4 minutes. Add diced tomatoes and butter. Stir ingredients to combine. Taste and adjust seasoning with salt and pepper. Serve over cooked rice. Garnish with chopped parsley.