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
- 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.
- 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.
- 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.
- 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.
- 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.