1Heat oven to 350ºF. Grease bottom and sides of rectangular pan, 13x9x2 inches.
2Melt milk chocolate and butter in 3-quart saucepan over low heat, stirring frequently; remove from heat. Cool slightly. Mix in sugar, vanilla and eggs. Stir in remaining ingredients except malted milk balls.
3Spread batter in pan. Sprinkle with malted milk balls.
4Bake 30 to 35 minutes or until toothpick inserted in center comes out clean; cool. For 48 brownies, cut into 8 rows by 6 rows.