Wall oven in corner with angle filler

[MMeabrodE]

   I have a client who wants angle wall oven and she like how this picture looks.  How do I put a filler on an angle to fill the gap?

[DBCooper]

In the picture below, I used a clipped cabinet box corner for the cabinet on the left and a separate angled front cabinet for the filler on the right.  Either way should work but the angled front filler has an advantage if the angle needs to be something other than 45 degrees.