Measure oats to get 2 cups then blend them in a high-powered blender until they resemble a fine flour. Transfer to a medium bowl.: When you blend the oats , listen for a consistent higher pitched whir as the blades work, and watch for the powder to become uniformly fine without visible flakes. A fine oat flour gives the dough a smooth mouthfeel and helps it bind; if it is left coarse you will end up with a gritty texture and a less cohesive dough. A common error is overfilling the blender, which causes uneven milling, so work in batches if needed. If you notice larger bits after pulsing, return them to the blender and pulse again in short bursts, scraping down the sides between pulses to ensure an even grind.
Add 1/4 cup melted coconut oil, maple syrup, vanilla, and salt to the bowl. Stir until combined. Gently fold in mini chocolate chips.: As you stir, you should see the mixture transform into a glossy, slightly sticky mass that holds together when pressed between your fingers; the aroma will shift to a sweet, toasty scent with coconut notes. This binding step is essential because the coconut oil and maple syrup provide the moisture and fat that let the dough compress into a cohesive layer. If it seems too dry, add a teaspoon of maple syrup at a time, but avoid over wetting, which makes the dough soggy. A common mistake is stirring too vigorously, which can break up the mini chocolate chips and make the dough uneven; fold gently so the chips remain intact.
Line a sheet pan with parchment paper. Press the cookie dough into an even 1/4-inch layer. Freeze for 5–10 minutes.: Pressing the dough firmly and evenly is critical for a uniform final bark thickness; run your fingers or a spatula across the surface to remove air pockets and create a smooth top. When chilled, the dough firms slightly and develops a compact texture that makes slicing clean later. You should feel the dough cool and slightly firm to the touch after chilling. A typical issue is uneven pressing which leads to pieces of varying thickness, so take a moment to smooth edges and corners for consistent slices.
While the bark chills, add 3/4 cup chocolate chips and 1 tsp coconut oil to a microwave-safe bowl. Microwave in 20-second bursts, stirring between each, until melted and smooth.: Heat gently and stir frequently; you will notice the chocolate start to soften around the edges before it fully liquefies, and stirring will create a shiny, velvety texture. The teaspoon of coconut oil helps the chocolate loosen and results in a glossier finish that sets with a nicer snap. Overheating is the most common pitfall, which causes graininess or burning; remove the bowl when mostly melted and stir until fully smooth, letting residual heat finish the job.
Pour melted chocolate over chilled cookie dough layer and spread evenly with the back of a spoon.: As you spread the warm chocolate, it should glide and create a glossy surface that contrasts with the matte cookie dough below. Work quickly but carefully so the melted chocolate does not begin to set too soon; the visual cue you want is a uniformly coated sheet with tiny ripples from the spreading motion. If the chocolate sets before you finish, warm it briefly for a few seconds and continue, but avoid overheating. An uneven pour or patchy spreading will create thin spots that may break more easily when cutting.
Return to freezer for at least 30 minutes, or until firm.: The freezing step is about setting and contrast, and the chocolate should become firm to the touch with a satisfying snap, while the dough remains slightly tender inside. You will notice the chocolate lose its gloss just a touch as it fully solidifies. Leaving it in the freezer longer improves slicing and storage stability. A common mistake is removing it too soon, which results in smearing when you try to cut it, so confirm that the center is fully firm before moving on.
Remove from the freezer and cut into pieces. For clean cuts, run a sharp knife under hot water, dry it, slice, and repeat as needed.: The clean cut technique uses heat to glide through the chocolate, giving you smooth, polished edges. After dipping the knife, wipe it dry to avoid water dripping onto the bark, which can create streaks. You should hear a crisp sound as the knife slices through the set chocolate, and you will see neat, uniform squares or shards depending on your cut. If pieces crumble, warm the knife slightly more and apply gentle, steady pressure rather than sawing motions.