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In small saucepan over medium heat, combine blackberries, cane sugar and water.
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Simmer for about 10–12 minutes, stirring occasionally, until berries break down and mixture thickens slightly.
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Remove from heat, stir in vanilla extract.
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Strain through fine mesh sieve to remove seeds and pulp. Pour into jar and refrigerate.
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In small skillet, melt butter over medium heat.
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Add brown sugar and oats. Stir continuously for 3–5 minutes, until golden and fragrant.
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Remove from heat and let cool. The mixture will crisp up as it cools.
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Fill glass with ice.
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Add 2–3 tbsp blackberry syrup.
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Pour in oat milk.
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Add 2 shots of espresso
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Top with cold foam, if using.
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Sprinkle oat crisp on top and enjoy immediately!