1Heat oven to 375°F (350°F for dark or nonstick pan). Line cookie sheet with cooking parchment paper.
2In 2-quart saucepan, melt butter over medium heat. Stir in sugar and corn syrup. Heat to boiling over medium-low heat, stirring constantly, until sugar is dissolved. Remove from heat. Stir in flour, almonds and vanilla until blended. Quickly spread mixture into 11x10-inch rectangle on cookie sheet.
3Bake 10 minutes or until brittle spreads thin and is deep golden brown. Cool 5 minutes; remove from cookie sheet to cooling rack. Cool completely, about 15 minutes.
4In small resealable freezer plastic bag, place chocolate chips; seal bag. Microwave on High about 1 minute or until softened. Gently squeeze bag until chocolate is smooth; cut off tiny corner of bag. Squeeze bag to drizzle chocolate over brittle. Let stand 1 hour or until chocolate is firm. Break into irregular pieces.