how to oven cook bbq baby back ribs

So I watched Nigella Lawson’s program and she took some chicken thighs and ribs and put them in a bag with BBQ Sauce and marinated them over night, then the next day cooked them for 90minutes in a cassarole dish at 400 degrees. 

First, that makes me think the thighs will be over done. I’ve cooked chicken parts in the oven at 375 for 45 minutes, This is twice as long and hotter too. then I look at the instructions on the ribs and it says 300 degrees for 2 hours.  

THEN I go on line and every single one of the recipies cooks the ribs dry and then adds the sauce at the last minute…

HELP! What’s a body to DOOOOO?

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