Remove the outer leaves of the cabbage, cut it into quarters, remove the core, and slice into thin, noodle-like strips.
Heat the butter and olive oil in a large skillet over medium heat.
Add the sliced cabbage and season lightly with salt. Sauté for 8–10 minutes, stirring occasionally, until tender and slightly softened.
Add the minced garlic and cook for 30–60 seconds until fragrant.
Reduce heat to medium-low and pour in the heavy cream. Let it gently simmer for 2–3 minutes, stirring occasionally.
Gradually stir in the Parmesan cheese until melted and smooth.
Season with black pepper, red pepper flakes, and Italian seasoning if using.
Toss the cabbage until evenly coated in the sauce. Simmer for 1–2 more minutes until creamy.
Remove from heat and serve immediately.