Ingredients

• 1/2 cup unsalted butter, softened
• 2 tablespoons finely chopped onion
• 2 tablespoons Parmesan cheese
• 1 tablespoon mayonnaise
• 3 cloves garlic, or to taste
• 10 fresh basil leaves
• 1/4 teaspoon salt (optional)
• 1/4 teaspoon ground black pepper

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Instructions

1. Combine butter, onion, Parmesan cheese, mayonnaise, garlic, basil leaves, salt, and pepper in a food processor; pulse until smooth.