The issue will be if oat malt has enough diastatic power to convert itself. If so, you can do a minimash (really just a steep with controlled water amount, temp, and time). If not, you'll need to add some pale malt and do the same process. But oat malt will not give you the same flavor results as flaked oats. For the 4 oz. that's called for in the recipe, it may not make much difference which method you use, or even if you leave them out.

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