My wife complained that there was not an AC outlet anywhere above the sink area of our 2017 27.5 RKDS. So, I began to take a look around and find a place to pick up power and add a convenience outlet. The cabinet to the left of the microwave is where the microwave plugs in. So, I figured I could get power from that outlet.
After removing the microwave, the back of the outlet is to the left with 12/2 with ground feeding it. There was sufficient slack in the 12/2 to cut the wire and mount a junction box. There is also a 12v wire back there that feeds the existing 12v light under the kitchen cabinets above the sink. You will have to cut a hole the size of your outlet box in the bottom of the cabinet above the counter. Your 14/2 wire will pass through the same hole that the 12v wire goes through. Careful cutting the hole since the 12v wire is in the space you are making access for your outlet box.
So, what you will need to do this project is:
2-ea shallow single gang boxes. One of these will be used as the junction box behind the microwave. It is important that these be shallow boxes. There is only about a 2" space between the cabinet bottom fascia and actual bottom of the cabinet. It's an open space for the 12v wire to run to the light. The outlet boxes I got from Lowes measured 3 - 1/2L x 2 -3/16W x 1 -3/4D and had tabs on the box that allowed them to flush mount.
About 3 feet of 14/2 with ground.
3-ea wire nuts.
1-ea 120v outlet. I picked up a cheap one that is 15 amp rated.
A few screws to mount the junction box to the wall and to mount the outlet box under the cabinet.
1-ea blank wall plate for the junction box.
1-ea duplex wall plate for the outlet.
Took me about 2 hours to do the work which included a trip to Ace Hardware and a pause for a cold one
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but I assure you it happened ... my assurance was when I showed the end results to the wife 
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