MELT BUTTER; ADD PARSLEY, SALT, ONION, AND CELERY. SWEAT UNTIL TRANSLUCENT. ADD CLAMS W/ JUICE AND BRING TO BOIL. ADD POTATO CHUNKS;BOIL UNTIL SOFT. LOWER HEAT TO MEDIUM LOW AND ADD ALL THE CREAM W/ 1/2 CUP INSTANT POTATO FLAKES TO THCKEN. SIMMER ON LOW 20 MINUTES. ADD SALT AND PEPPER TO TASTE. IF TOO THICK ADD LITTLE MILK. IF NEEDS THICKENING ADD POTATO FLAKES.