Place 3 of the chocolate squares and the butter in large microwaveable bowl. Microwave on HIGH 2 min. or until butter is melted. Stir until chocolate is completely melted.
Stir in sugar and vanilla until well blended.
Add eggs, 1 at a time, beating with electric mixer on low speed after each addition until well blended.
Add 1/4 cup of the flour and the baking soda; mix well.
Add remaining 1 cup flour alternately with the water, beating until well blended after each addition.
Pour evenly into 9-inch round cake pan sprayed with cooking spray.
Bake 30 min. or until toothpick inserted in center comes out clean. Cool in pan 10 min.; remove from pan to wire rack. Cool completely. Top with the COOL WHIP DIPS and strawberries just before serving. Melt remaining 2 chocolate squares as directed on package; drizzle over cake.
Let stand until chocolate is set. Store in refrigerator.