I do a BIAB oven mash and here is how I do it. I use 2 pots in my process.
Heat strike water to 163-170 depending on target mash temp. Place oven on low for me 175.
Dough in and adjust temp as needed till target is acquired.
Turn off oven, cover pot and place in oven. Mash for desired time.
With about 15 mins left in mash I heat my mash out water in a second sparge pot to 184 or so.
Remove mash from oven, lift and drain bag over pot, then transfer bag to sparge pot stir and verify temp of 168-170. Place in oven for 10 minutes while putting initial pot on heat, after 10 minutes pull pot and add wort to 1st pot on heat, hold bag over pot and squeeze(careful HOT gloves are nice here.)
Proceed to boil
This is my current process in a nut shell. I do partials with about a 6lb grain bill. It took me a few tries to get my process down but it now smooth and works well for me. YMMV!
Good luck and have fun.
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