This is the recipe I grew up with and we always loved it! It's super simple and, of course, being good German Lutherans, it is made with beer instead of wine:
1 can beer (whatever you like!)
3 tbsp butter
3 tbsp flour
1 1/2 cups grated swiss cheese
1 1/2 cups grated cheddar (or sharp cheddar depending on how you like the flavor)
In a saucepan melt butter and add the flour until combined. Slowly add the can of beer. Allow the sauce to thicken, then stir in the cheeses until melted.
It's that simple! Then transfer to a fondue pot to keep warm. We always just served it with cubed, toasted french bread. mmmmmm Great winter treat.
ps....You can always add more cheese too, if you like it thicker!
"For God did not give us a spirit of timidity but a spirit of power, of love and of self discipline." 2 Timothy 1:7