Line 8" x 8" square baking pan with foil or parchment, extending foil or parchment over sides of pan. Spray foil or parchment lightly with cooking spray; set aside.
In large bowl, combine almond butter, oil and brown sugar until smooth. Whisk in milk and vanilla slowly, followed by dry ingredients until smooth, thick batter comes together. Fold in dark-chocolate chunks.
Spread batter (it'll be thick) into baking dish in even layer. Sprinkle top with more dark-chocolate chunks, if desired.
Bake for approximately 20-25 minutes or until top is golden brown and appears set.
Cool completely in pan before cutting into squares, as blondies may crumble if cut too early or while too warm.