1. 1. In a saucepan, melt butter over medium heat.

2. 2. Whisk in all-purpose flour until smooth.

3. 3. Stir in brown sugar and sugar until combined.

4. 4. Slowly pour in 2% low-fat milk, stirring constantly until the mixture thickens.

5. 5. Remove from heat and stir in pure vanilla extract.

6. 6. In a separate bowl, whisk eggs and slowly add a small amount of the hot milk mixture while whisking constantly to temper the eggs.

7. 7. Pour the tempered egg mixture back into the saucepan and cook for another 2-3 minutes until thickened.

8. 8. Remove from heat and let it cool slightly before serving.

9. 9. Serve warm or chilled, garnished with a sprinkle of cinnamon or nutmeg if desired.