Line 20 wells of a 24-well mini muffin pan with foil baking cups.
In a heavy-bottom medium saucepan, combine brown sugar, granulated sugar, cream, butter, and water, stirring to blend.
Cook over medium-high heat, stirring constantly until mixture registers just below 238° on a candy thermometer.
Remove pan from heat, and add pecans, stirring vigorously to cool mixture slightly.
Working quickly and using a levered 1-tablespoon scoop, divide pecan mixture among prepared wells of mini muffin pan.
Let cool completely.
Store pralines in an airtight container at room temperature.
Remove from foil baking cups before serving, if desired.