1Heat oven to 350°F. Spray 11x7-inch (2-quart) glass baking dish with cooking spray. Cook rice as directed on package, using 2 tablespoons of the butter and 1/4 teaspoon of the salt.
2Meanwhile, in 12-inch skillet, melt remaining 1/4 cup butter over medium-high heat. Cook mushrooms, leek and garlic in butter 3 minutes, stirring occasionally, until tender. Reduce heat to medium. Stir in flour. Gradually add milk; heat to boiling. Cook 5 minutes, stirring constantly, until thickened. Remove from heat; stir in 1/2 cup of the cheese.
3In large bowl, mix cooked rice, milk mixture, chicken, broth, pepper and remaining 1/2 teaspoon salt until blended. Spoon into baking dish. Sprinkle with almonds and remaining 1/2 cup cheese. Bake uncovered 20 to 25 minutes or until thoroughly heated and cheese is melted.