Caramel Rice Krispie Bars

Today I was in the mood for something sweet, but it's pretty hot out today for Minnesota so I decided to make my sister, Diane's, caramel rice krispie bars.  I only made half of her caramel filling because they are so rich already, but the whole filling is super decadent and delicious.  Here is the recipe:

Caramel Rice Krispie Bars:

Step 1:
in a microwave safe bowl combine:
36 kraft caramels unwrapped
a small can of sweetened condensed milk
1/2 stick of butter

Place in microwave and heat one minute on high.  stir.  at this point can do one more minute more or less until the caramels are melted and it's smooth when you stir it.  set aside.

Step 2: 
in a large microwave safe bowl combine:
1/4 cup (1/2 stick) butter
1-1/2 pkg mini marshmellos

microwave same as above, until smooth when stirred. remove and add 9 cups rice krispies stir well together.

Step 3:
Pat 1/2 of the cereal mixture onto a 15 x 10 bar pan that has been lightly buttered.  pour caramel mixture over the top of it.  Pat the rest of the cereal mixture over the caramel layer, cool in fridge until set.