3 types of sandwiches

I wonder how I can keep the firmness of the bread. It looks like soft tofu. Perhaps I can bake the bread first, then assemble?

 

Update [July 28]: I created more toasts and sandwiches!

3 types of sandwiches - image 1 - student project

3 types of sandwiches - image 2 - student project

 

3 types of sandwiches - image 3 - student project3 types of sandwiches - image 4 - student project