Preheat oven to 350. Butter a 3 quart round souffle or other baking dish.
In a saucepan, over medium heat, melt butter. Whisk in flour until smooth.
Whisking constantly, slowly pour in milk and cook until think and bubbling, about 3 minutes.
Reduce heat to low and stir in cheese until melted; remove from heat.
In a bowl, stir together egg yokes, salt and 1 tsp paprika.
Stir in cheese sauce and rice.
In another bowl, with a mixer on high speed, beat egg whites with cream of tartar until stuff but still glossy.
Stir 1/4 of beaten egg whites in to the rice mixture to lighten, then gently fold in remaining egg whites.
Bake until puffy, golden drown and just set in center, 45 min to 50 mins.
Enjoy!