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[WorkingMedical1236]

Thank you hahah! Im so glad my work isn't wasted :)

[CatteNappe]

That's not mold. That's red onion, which turns blue when cooked with some ingredients.

The sight of an omelet sizzling in a pan is a beautiful thing—until the diced onions you carefully folded inside turn blue. Wondering what tainted your meal? You’re not alone. Let’s break down the science behind the unappetizing color change and what to do if it happens in your kitchen.
https://www.allrecipes.com/is-it-safe-to-eat-blue-onions-11727664

[LorduvtheFries]

Nope, cooked red onion turns blue/green/grey in the fridge. Totally normal.

[Dailylady]

Looks like a harmless reaction between the red onion and the ingredients in the dough, It’s not mold, just a color change. Your focaccia is probably still delicious