rework dynamic sql into stored procedure with optional parameters

CREATE PROCEDURE TestProc
(
@Param1 varchar(50) = NULL,
@Param2 varchar(50) = NULL,
@Param3 varchar(50) = NULL
)
AS
SELECT
*

FROM
TestTable

WHERE
((@Param1 IS NULL) OR (col1 = @Param1)) AND
((@Param2 IS NULL) OR (col2 = @Param2)) AND
((@Param3 IS NULL) OR (col3 = @Param3))