If a recipe calls for 'ready-prepared potato wedges', what exactly does that mean
"Ready-Prepared" typically means a packaged product.  Many 'ready-prepared' potato products are par cooked and coated lightly in oil before freezing, so cutting your own may be a problem.

A specific recipe would be useful, so that we can give recommendations on how to deal with freshly cut potatoes (par cook vs. adjusting time/temperature of the whole dish)