Easy Cottage Pie

Name: Easy Cottage Pie
Prep time: 30 min
Cook time: 30 min
Total time: 1 h
Cuisine: American
Ingredients: 2 pounds Yukon gold potatoes; 1/2 cup salted butter, divided; 1/4 cup heavy cream; 1/4 cup whole milk; 1 cup carrots (diced); 1/2 cup yellow onions (diced); 1 cup frozen peas; 3-4 cups leftover pot roast and gravy (or 1 pound ground beef plus one packet of beef gravy); 1/2 teaspoon paprika; fresh thyme (for garnish); salt and pepper (to taste)