Easy Challah w/Onion Filling

Ingredients

• 1 cup warm water
• 1-1/2 tablespoons dry yeast or 1-1/2 to 2 packages
• About 5 cups flour, divided
• 1/2 cup sugar
• 1/2 tablespoon salt
• 1/2 cup butter or margarine
• 2 eggs, room temperature
• 1/2 cup dehydrated onions
• 4 teaspoons poppy seeds
• 2 tablespoons oil