Making Cajun seasoning at home is easy. Combine 1 tablespoon paprika, 1 tablespoon garlic powder, 1 tablespoon onion powder, 1 tablespoon dried oregano, 1 tablespoon dried thyme, 1 teaspoon cayenne pepper (adjust to taste), 1 teaspoon black pepper, and 1 teaspoon salt. Mix these spices thoroughly, and you'll have a homemade Cajun seasoning ready for your shrimp and polenta recipe. Adjust the heat level by adding more or less cayenne pepper.