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U225X / ENGINEERING UNWARRANTED

Two boxed brownie mixes in a 9 × 13 pan

Public record / FOOD-040 / Revision A

PUBLIC RECORD
U225X

First check the pan yield printed on each box. Two small-pan mixes may suit a 9 × 13 pan; two family-size mixes may be too much. Brand-dependent technique; no exact box weight was supplied.

STATUSRecovered/PartialCLASSIFICATIONFOODMATERIALKITCHEN / RECIPEDATE2026.09.01

A RECIPE TO MAKEADDED TO THIS RECORD

A named-mix example supplies exact quantities; the historical unspecified-box advice cannot define a universal ingredient list.

Added . This recipe addition is separate from the original notes below; it is not a claim of a tested batch.

Two-mix fudgy brownies in a 9 x 13-inch pan

New matching recipe using a specified mix and the manufacturer’s published double-batch ingredient totals, with a newly adapted 9 x 13-inch workflow. The original box brand and a universal deep-pan bake time were not recovered.

YIELD
24 brownies
PREP / WAIT
10 minutes; at least 2 hours cooling
COOK
Approximately 40–60 minutes at 325°F; follow the selected mix’s double-batch directions

Ingredients

  • 2 standard packages Ghirardelli Dark Chocolate Brownie Mix, each intended for an 8- or 9-inch square pan
  • 1/2 cup (120 ml) water
  • 1 cup (240 ml) neutral oil, such as refined peanut oil or canola oil
  • 2 large eggs
  • 1 tsp oil, for the pan

Method

  1. Check that each selected package calls for 1/4 cup water, 1/2 cup oil and 1 egg. This card’s totals are for that formula; a differently formulated mix requires its own package quantities.
  2. Heat oven to 325°F. Lightly oil a light-colored metal 9 x 13-inch pan and line with parchment extending over the long sides.
  3. Whisk water, oil and eggs, then stir in both dry mixes just until combined. Spread evenly in the pan; do not whip air into the batter.
  4. Use the product’s two-package 9 x 13-inch bake time if printed. Otherwise begin checking at 40 minutes and allow approximately 40–60 minutes for this adaptation. Look for a set surface, firm edges and a center that does not flow when the pan is gently moved; a chocolate-chip pocket can appear wet even when the surrounding batter is baked.
  5. Cool undisturbed on a rack for at least 2 hours. Do not compress the warm slab. Lift by the parchment and cut only after it is fully cool; chilling the cooled slab for 30 minutes can help clean cuts.

Notes & storage

  • This is a specified, measurable mix example because the original box brand is not recoverable from the text. It does not claim to be the original product or its manufacturer-tested 9 x 13 method.
  • The historical fewer-eggs modification is retained in the conversation record; this supplement uses the selected mix’s full egg amount for a sliceable result.
  • Keep airtight at room temperature up to 3 days or freeze up to 2 months.

Recipe basis & references

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TECHNICAL NOTES

First check the pan yield printed on each box. Two small-pan mixes may suit a 9 × 13 pan; two family-size mixes may be too much.

SPECIFICATION

TypeKitchen / recipe
SourceRecovered notes and content manifest
ValidationNext test should record batch, temperature, time, and result
FocusBatch size, heat path, center doneness, and texture

DEVELOPMENT HISTORY

2026.09.01Rev AImported as an independent manifest record; public copy keeps uncertainty visible.