Perry Mason = Pillsbury Doughboy

This made me laugh.
"The hell of it is," Drake said, turning to Della Street, "that when the Chief gets this sketch he's going to feel just the same way about it I do. He's like a bride's biscuit — he puts up a hard-boiled exterior, but when you bust through him he's all soft and mushy on the inside."
(The Case of the Counterfeit Eye, Pocket Book edition, 1965, p. 84)

Other allusions to brides and biscuits:

As every open-hearth man knows, molten steel is not unlike a bride's biscuit — it sticks to things. (Iron and Steel Engineer, Vol. 27, No.6, p. 49).

 Another storm filled the roads again. Once more they plowed and that night the ground froze harder than a bride's biscuit. (The Eagle Pine by Dirk Gringhuis, 1958, p. 156).

 My overblown lust went flat as a bride's biscuit, and from the shadows of Shubert Alley I heard the mournful laughter of Rick Bluestone, who would never call a spade a heart. (Devils and Demons by Marvin Kaye, 1991, p. 563)

If there were no air inside your chest to push outward with the same pressure, you'd be squashed flatter than a bride's biscuit. (Basic Machines, U.S. Bureau of Naval Personnel, 1946, p. 109).

Oh Dickie, that's your worst bride's biscuit yet. You know, the biggest compliment a man could give a girl is to say she's changed him — even a little. Even to make him crazy. (The Heart Alone by George Locke Howe, 1951, p. 307).

When he gets married he's disappointed because his wife's cooking doesn't taste the same. Take Bisquicks. The average man laughs at "bride's biscuit jokes." Biscuits, to a man, are the biggest test of a woman's cooking ability. (Good Housekeeping, Vol. 102, 1936, p. 106).

"Bride's Biscuit is hard as a rock." (Bugs Bunny and the Grey Hounded Hare, 1949).