Peel bananas. Slice bananas into 1/2-inch-thick pieces. Line baking sheet with parchment or waxed paper. Arrange banana pieces close together in a single layer on prepared baking sheet.
In a heavy small saucepan, melt chocolate over low heat. Place melted chocolate in small resealable plastic bag. Seal bag and snip off a tiny corner. Drizzle chocolate over banana slices. Cover and freeze for 1 to 2 hours or until frozen.
Divide banana pieces among four freezer containers or small resealable freezer bags. Freeze for up to 3 days.