Potato Gratin with Mixed Mushrooms

  • 16
  • 30 mins
  • 120 mins

Ingredients

  • 1/4 cup butter, divided
  • 1 lb. mixed fresh mushrooms (button, crimini), sliced
  • 3 Tbsp. flour
  • 1-1/2 cups milk
  • 1/2 cup BREAKSTONE'S or KNUDSEN Sour Cream
  • 1 pkg. (8 oz.) KRAFT Finely Shredded Italian* Five Cheese Blend
  • 1/2 tsp. salt
  • 1/4 tsp. pepper
  • 2-1/2 lb. Yukon gold potatoes (about 8), peeled, sliced 1/8 inch thick
  • 2 Tbsp. KRAFT Grated Parmesan Cheese

Preparation

Step 1

HEAT oven to 375ºF.

MELT 1 Tbsp. butter in large skillet on medium-high heat. Add mushrooms; cook 6 min. or until tender, stirring frequently.

MELT 2 Tbsp. of the remaining butter in medium saucepan on medium heat. Whisk in flour; cook and stir 1 min. Gradually whisk in milk, then sour cream; cook 4 min or until thickened, stirring constantly. Stir in shredded cheese, salt and pepper; cook 1 min. or until melted.

GREASE 3-qt. casserole with remaining butter. Layer 1/3 each of the potatoes and mushrooms in casserole; repeat layers twice. Cover with cheese sauce. Sprinkle with Parmesan; cover.

BAKE 1-1/2 hours or until potatoes are tender and top is golden brown, uncovering after 1 hour. Let stand 10 min. before serving.