Out of 150 grams, take 100 grams of chocolate in a microwave safe bowl. However you can melt chocolate in double boiler as well.
When chocolate melts completely, pour few spoons of it in a chocolate silicon mould.
Lift and rotate the mould here and there so that Chocolate gets coated on all the four sides of the mould.
You can use the spoon as well to coat the walls of mould.
Once properly coated, flip the mould over the bowl carrying chocolate so that extra chocolate drips out of the mould.
Place the mould in refrigerator for 10 minutes so that Chocolate sets properly.
Now pour the caramel on each cavity.
Again put the mould in refrigerator for 10 minutes.
Once again add rest of the chocolate (50 grams) in the bowl in which chocolate was earlier melted, and melt this chocolate too.
Pour this chocolate over the caramel in a way that the caramel is thoroughly sealed.
Again put the mould in refrigerator for atleast 30 minutes so that Chocolate sets firmly.
Now take out the chocolate from the moulds.
Enjoy.