Millionaire's Bars

Millionaire's Bars
Taken from:  Joy of Baking 

 

Below:
How to Carmelize sweetened condensed milk in the microwave.

FOR CARAMEL FILLING:  If using Dulce de Leche then simply warm the caramel in the microwave or in a heatproof bowl set over a saucepan of simmering water. If using sweetened condensed milk, pour the milk into a heatproof bowl and place the bowl over a saucepan of simmering water. Cover and cook, over low heat, stirring occasionally, for 60 to 90 minutes or until the milk has thickened and has turned a caramel color. Remove from heat and beat until smooth.  Pour the caramel over the baked shortbread and leave to set.

Note: You can also do this step in a microwave oven. Place the sweetened condensed milk in a large microwaveable bowl and cook on medium power for about 4 minutes, stirring halfway through baking time. Reduce the powder to medium-low and continue to cook for another 8 to 12 minutes, or until the milk has thicken and has turned a light caramel color. Remove from microwave and beat until smooth.