We would never presume to start recommending which foods go with which wines or vice versa. There are many other places for you to find out about that, all of them far better qualified than we are. Instead, what we are suggesting here are pairs of neighbouring cellar doors that make for a successful visit without too much travelling around between stops.
 
One of the secrets of a great day out visiting cellar doors is not trying to do too much. Pick quality over quantity every time. Three wineries is usual a sensible limit (intoxication aside) simply because you’ll start struggling to remember them all and to distinguish between the wines. Like all your senses, taste can be overwhelmed. 
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A more relaxed way to structure your day is to visit one winery, do a tasting and then stay for lunch.  Typically, this will be a cheese and/or meat platter, or perhaps a pizza, probably accompanied by a glass of your newest favourite wine (unless you’re the designated driver). After lunch you can either walk or complete a short drive to a neighbouring winery and spend the rest of your afternoon working through its wine list. 

Barossa Valley (North):
Atze’s Corner (lunch) then Rosenvale Wines (Saturdays only, check first)
Barossa Valley Estates (lunch) then Two Hands

Clare Valley:
Mitchell Family Wines (lunch) then Jeanneret Wines
Reilly Winery (lunch) then Matriarch and Rogue Wines (all in Mintaro)