I used this concoction the other day to replace sweetened condensed milk in a recipe. It was in baked goods, not a pastry, so I cannot say how it would work in a pastry.
Sweetened Condensed Milk Substitute
1 cup instant dry milk (I used fat free. The recipe called for solid, I used powdered)
2/3 cup sugar
1/3 cup boiling water
3 tbsp melted butter
Combine all ingredients in a blender. Blend until smooth. Store in refrigerator until ready to use. Yields approximately 14 ounces (a little less than a can). Note: it is NOT as thick as canned sweetened condensed milk. You can add cornstarch to thicken if you want.
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