My Grandma Martha's Paska Recipe
Put the flour in a large mixing bow, with salt and yeast. Whisk eggs, add strained potato water, warm milk, sugar, softened butter, oil and vanilla. Add all to flour mixture, and stir and knead until you can form it into a ball. If it's still a tad too sticky put some butter on your hands.
Shape into a ball, cover with a damp tea towel and let sit to rise in a warm place until about double in size.
Preheat oven to 180 C (350 F)
Then, punch down, and separate into four balls. Place on prepared (parchment paper) baking sheet. Let rise again for about an hour. Then bake for about 20-25 minutes until browned and done.
To test for doneness, tap the top of the Paska, it should be quite firm.