Pre-heat oven to 350 and spray bottom and sides of 9" spring form pan
Melt butter and cream cheese in a large bowl in microwave and whisk together
whisk in cream, salt, pepper and chopped dill
add 6 large eggs and whisk together well
shred gruyere cheese and set aside
Take largest (center portions) of round bread and dip in egg mixture. You will add two pieces to form the round to match the pan. You may have to use portions of smaller pieces to fill the round completely.
Crumble close to half of the smoked salmon on top of the bread.
Sprinkle a third of the shredded gruyere on top of the salmon
Repeat steps 6-9 for layer two
Repeat steps 6-9 for layer three, but in this layer, you will have little (or none if you prefer) smoked salmon
Pour any remaining egg/cream mixture evenly over the final layer
Place springform pan on jelly roll pan (or something large enough with lip in case there is leaking liquid)
Cover with foil and bake for 20 minutes covered
Remove foil and bake another 20-30 minutes uncovered until it feels firm in the center
Cool for 10 minutes, remove outer form, slice, serve and enjoy!