Duchees Potato

1 lb. peeled Russet potato
2 small egg yolks (like Costco)
2 T. heavy cream
2 T. melted butter (mix into mix)
1 and 1/2 T. butter to drizzle over
1T. salt to boil potato
1/4 tsp. white pepper for mix
convection roast 400 degrees for 20 - 25 minutes