In a large skillet, melt the butter and olive oil over medium heat.
Add the minced garlic and sauté for about 1-2 minutes until fragrant, being careful not to burn it.
Pour in the heavy cream and bring to a gentle simmer, stirring frequently.
Gradually whisk in the grated Parmesan cheese until melted and smooth.
Stir in the black pepper and salt, adjusting to taste.
Remove from heat and let the sauce cool slightly before serving over cooked cacio e pepe ravioli.
Garnish with chopped fresh parsley before serving.