How to fill 'gap' between surfaces?

I am creating an object with the shape of a bowl or a frisbee. The way i thought of is to make two parallel paraboloid surfaces and then find a way to “connect” them, to create a solid.
Any advice much appreciated,

Loft would work. Or draw a line that connects the two surfaces and use Sweep2. Or BlendSrf. Or, since your surfaces are parallel, you could draw one of the two surfaces and use OffsetSrf with Solid=yes option to create it all at once.

Much appreciated Peter, cheers