• 2   cups  chocolate graham-cracker crumbs
• 1/3  cup  sugar
• 1/2  cup  butter or margarine, melted

• 1/2  cup  butter
• 1  (12-ounce)   package semisweet chocolate morsels
• 4  (8-ounce)  packages cream cheese, softened
• 2  cups   sugar
• 4    large eggs
• 1  tablespoon  cocoa
• 1  teaspoon  vanilla extract
• 1  (16-ounce)   container sour cream

•     Whole strawberries

1.

Combine first three ingredients in a mixing bowl; stir. Press firmly in bottom and 1 inch up sides of a 10-inch springform pan. Chill.

2.

Preheat oven to 300 degrees.

3.

Melt butter and chocolate morsels in a heavy saucepan over low heat on stovetop, stirring often. Set aside.

4.

Beat cream cheese in a mixing bowl with an electric mixer at medium speed until creamy. Gradually add 2 cups sugar, beating well.

5.

Add eggs, one at a time, beating well after each addition.

6.

Stir in melted chocolate, cocoa, vanilla, and sour cream. Pour into prepared pan.

7.

Bake for 1 hour and 30 minutes; turn oven off. Leave in oven with door closed for 3 hours.

8.

Remove from oven. Gently run a knife around edge of pan to release sides. Cool completely in pan on a wire rack. Cover and chill for 8 hours.

9.

Remove sides of pan and garnish with strawberries, if desired, before serving.