Puree strawberries in a food processor. Strain through a fine mesh sieve to remove seeds; set aside. Beat the butter, cream cheese and salt in the bowl of an electric mixer until smooth and fluffy, about 5 minutes. Add powdered sugar, one cup at a time and mix until combined. Add strawberry puree and mix until smooth.
*Nutritional information is an estimate. Please consult a doctor or nutritionist for the most accurate nutritional info.