WHIP heavy cream to stiff peaks in large bowl. Combine sweetened condensed milk, pecans, butter, and maple flavoring in large bowl. Mix well. Fold in whipped cream.
POUR into 9- x 5-inch loaf pan or 2-quart container; cover. Freeze 6 hours or until firm. Store in freezer.
*To toast nuts: Place nuts in dry nonstick skillet. Cook over medium heat, shaking pan until nuts are lightly browned. To avoid over browning remove from pan immediately.