Whisk well eggs, heavy cream, half and half, Frangelico and sugar in a large bowl

Once mixed add your cinnamon roll pieces and mix throughly pushing cinnamon roll pieces down into the liquid to cover; allow to sit for at least 15 minutes to soak up the liquid or cover and place in refrigerator over night

Grease a 2 quart casserole dish and pour mixture into dish

Cover with foil and bake in a 300 degree oven for 1-1.5 hours -time will be dependent of how thick the your recipe is in your size pan-the less thicker the layer is the less time it will take to cook. I used a 1.5 quart casserole dish, mine took the full 1.5 hours.

Remove foil approximately 15 minutes before done and place butter pieces on top

Insert knie in middle to check for doneness, when knife comes out clean custard is set up.