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Heat oven to 350° F.
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Beat first 7 ingredients in a large bowl with mixer until blended.
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Stir in chopped chocolate and 2 Tbsp. crushed candy.
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Pour into 2 (9-inch) round pans sprayed with cooking spray.
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Bake 35 to 40 min. or until toothpick inserted in centers comes out clean.
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Cool in pans 10 mins. Loosen cakes from sides of pans; invert onto wire racks.
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Carefully remove pans. Cool cakes completely.
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Fill and frost cakes with COOL WHIP.
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Sprinkle remaining crushed candy just before serving. Keep refrigerated.