Heat a large skillet on med heat( 6-8), begin to sauté onion, celery, zucchini, salt & pepper to taste, until softened 5-10min. Add ground chicken, continue cooking until no pink shows in the meat. Remove from heat source add rice, cherries, parsley, gently mix in cream cheese and crumble feta on top. Adjust for salt. Set filling aside.
In a small casserole dish large enough to fit peppers standing, pour in 1/2c tomato sauce to coat bottom. If it is too thick add 2T water.
Cut 1/2" off tops of the peppers crosswise to remove stem. This will be the top presentation. Using hands remove the core with the seeds by twisting off gently. . If the peppers do not sit properly, carefully slice off part of the bottom to stand up properly. *Use any leftovers to sauté with filling*.
Using your fingers spread oil on outside of peppers and tops of peppers.
Begin to scoop filling into peppers, pressing down to fill.
Add remaining sauce ontop of peppers. Place lid back on.
Bake for 35-45min. uncovered in a 400F oven
Serve with any sauce that is on bottom of casserole dish.
Filling can be made up to 2 days in advance then stuffed into peppers.