Melt butter in a saucepan. Add onion and celery and cook until soft. Add flour, TASTE OF THE OKANAGAN DILL-ICIOUS SEASONING MIX and salt. Stir for 1 minute. Add chicken broth and simmer for 2 minutes.
Remove from heat and add chicken, sour cream and yogurt.
To make triangles, unroll phyllo and lay flat. (Keep the unused phyllo wrapped in a dampened towel) Cut a 2" wide strip. Brush the strip with butter and place 1 tsp of filling in the bottom corner and fold corner to corner (flag fashion) using entire strip.
Brush all triangles with butter and bake at 350 for 20-25 minutes.
Serve warm with Dill-icious Dip!