Quiches, Mushroom Mini

Ingredients

• 4-oz. cream cheese, at room temperature
• 4-oz. unsalted butter, at room temperature
• 1 cup all-purpose flour
• 1 dash salt
• 1/2 pound mushrooms, finely chopped
• 1/2 cup onion, finely chopped
• 4 tbsp. butter
• 2 tbsp. all-purpose flour
• 2 tbsp. heavy cream
• 1 egg yolk
• 1/4 cup grated Parmesan cheese