Melt butter and oil in a heavy nonstick pan over medium high heat. Saute garlic 2-3 minutes, until soft. Stir in spinach and cook 1 minute, stirring.
Add pasta and milk to spinach mixture. Season with salt and pepper to taste. Raise heat to medium high and cook 3 minutes, until sauce thickens slightly. Stir in cheese and toss gently.
Makes 4 servings.