Very tasty! I was really tempted to add thyme but I'm glad I tried it without. I suspect a good part of what made it successful was the Knorr vegetable bouillon. I used Yukon gold potatoes and yellow onions. Would certainly be even more delicious with bacon. I don't even think it needs cream.
This was so fun to bake and so easy! I used a spring form pan and it worked lovely! Halved the frosting which was more than enough for a smiley face and dotted border (not pictured)