Make toasted rice powder: Add the glutinous rice to a dry skillet over medium heat and cook, stirring frequently, until deeply golden and fragrant, 8β10 minutes. Cool completely, then grind to a coarse powder in a mortar and pestle or spice grinder.
Prep the aromatics and herbs: Thinly slice the shallots and scallions, and coarsely chop the mint and cilantro. Set aside. Prepare the cabbage wedges and cucumber slices for serving.
Cook the chicken: Heat a wide skillet over medium-high. Add the ground chicken and water and cook, breaking up the meat, until just cooked through with no pink remaining, 4β6 minutes.
Season while warm: Remove the pan from the heat and add the fish sauce, lime juice, granulated sugar, and dried Thai chili flakes. Toss until the chicken is evenly coated.
Thicken and perfume: Sprinkle in about 1.5 tablespoons of the toasted rice powder and toss until slightly thickened and glossy, 30β60 seconds.
Add fresh crunch: Fold in the sliced shallots and scallions, then gently mix in the mint and cilantro. The residual warmth should barely wilt the herbs.
Adjust and rest: Taste and adjust with a touch more fish sauce for salt or lime juice for brightness. Let the salad stand 2 minutes to meld.
Serve warm or at room temperature with cabbage wedges, cucumber slices, and steamed sticky rice.