Rather than waste what remained of the batter (out of habit, I test half-batches at a time), I winged it with regards to a solution by adding more flour to balance the fat. What emerged in Round Two wasn’t a complete failure, i.e., not a flapjack.
The best bakers annotate their cookbooks with notes and tips based on past experiences, and I have already put a big strike-through on the specification for 1.5 sticks of butter (correct amount: 1.25) in the pecan sandies recipe.
And, Stella, dear, we all make mistakes. You’re still my hero.