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Heat oven to 350ºF.
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Line a 13x9-inch pan with parchment paper, or spray with cooking spray.
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In large bowl, mix oats, flour, brown sugar, salt and 1 cup butter with spoon. Remove 1 cup; set aside for topping.
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Press remaining mixture into pan.
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In 2-quart saucepan, cook condensed milk, chocolate chips and 2 tablespoons butter over medium heat, stirring constantly, until chips are melted and mixture is smooth.
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Spread chocolate mixture over crust.
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Sprinkle with candies and reserved oat mixture; press into chocolate mixture.
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Bake 23 to 25 minutes or until set.
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Cool completely (about 2 1/2 hours) Cut into 8 rows by 4 rows.