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If you mean processed foods, I rarely do.  Maybe once or twice a year.  But I use the MW often to heat up fresh food for dinner.  I have created the two-plate meal where I cook fresh veggies and meat together in a MW.  And I'll do this two or three times a week.

Never           

Virtually every night 

Never. Either me or my wife cook our meals everyday. 

very often............

Once per week probably. 😊

THAT HAPPENS EVERY FRIDAY NIGHT...I HAVE BEEN COOKING ALL WEEK.

Once a week usually.

Never we don't have a microwave