Wikipedia gives several types of "biscuits", but no "tilling". I can't find any references in Google either.

On the En>Es question, Celia suggests "hacer galletas" (making biscuits), as "to till" can mean "to prepare". I suggest the same, taking "tilling" as a verb.

"Baking cookies" is indeed something that can bring fond memories... :)


http://unabridged.merriam-webster.com/cgi-bin/unabridged
1 : to turn or stir (as by plowing, harrowing, or hoeing) and prepare for seed : sow, dress, and raise crops from : CULTIVATE <learned to till the soil -- Eric Newton> <tilled the rocky land -- E.W.Smith> <helping to till the fields -- Will Irwin>
2 dialect England : PREPARE, SET <till a snare>


http://en.wikipedia.org/wiki/Biscuit

British English meaning

In British English a biscuit is a hard baked product which in North America would be called a "cookie" or "cracker". Many regional varieties, both sweet and savoury exist, often produced in industrial quantities by large food concerns. Sweet biscuits are commonly eaten as a snack and may contain chocolate, fruit, jam or nuts. Savoury biscuits, sometimes called crackers, are plainer and commonly eaten with cheese following a meal.

A basic biscuit recipe includes flour, shortening (often lard), baking powder or soda, and milk (buttermilk or sweet milk). Common variations involve cheese or sugar.
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Varieties

Common biscuit types include:

* Bath Oliver biscuits
* Bourbon biscuits
* Cream crackers
* Digestive biscuits
o Chocolate Digestive
* Lincoln biscuits
* Nice biscuits
* Rich tea
* Rubber biscuits
* Shortbread
* Water biscuits

Australians use the British English meaning of biscuit. A famous Australian biscuit is the Tim Tam.