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Classic no-bake cookies are made with cocoa, oats, and peanut butter for a one-of-a-kind treat that's perfect for lunchboxes or after-school snacks.
Combine cocoa and sugar: Line 2 large rimmed baking sheets using parchment paper. Whisk together brown sugar, cocoa, and salt in a large saucepan until combined.
Add butter and milk: Add butter and milk to saucepan. Bring to a boil over medium-high, stirring constantly, until sugar and cocoa are fully dissolved, about 5 minutes. Remove from heat.
Add oats, peanut butter, and vanilla: Working quickly, stir in oats, peanut butter, and vanilla using a heatproof rubber spatula, stirring until well combined.
Scoop cookies: Using a tablespoon measure, drop heaping tablespoons of mixture onto prepared baking sheets in a single layer, gently pressing center of each cookie to flatten slightly or to desired thickness.
Cool cookies: Let cookies cool completely at room temperature, about 45 minutes, sprinkling with flaky sea salt after cooling for 10 minutes. (Alternatively, for a firmer texture, refrigerate cookies until set, about 30 minutes.)