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Combine milk and sweetener in a medium saucepan. Whisk stirring constantly to dissolve sweetener over medium heat.
When the milk begins to steam, lower the temperature to as low as possible.
Dip a straw into the milk and use a permanent marker to draw a line on the straw, just above where the milk hit.
Allow milk to reduce to half in size from what it first was, periodically checking with the straw and stirring. This took approximately 2 hours and 30 minutes for me.
When milk is reduced by half, remove from heat and whisk in butter and vanilla extract.
Pour into a clean glass jar and allow to cool completely. Store in the refrigerator.