Preheat the oven to 425 degrees F.
Spray a parchment-lined casserole dish with nonstick spray and lay the salmon in it skin-side down.
In a small bowl, whisk together the mustard, maple syrup, olive oil, thyme and cumin. Pour the mixture over the salmon, spreading to coat it evenly.
Bake until just cooked through, 12 to 15 minutes. Transfer the salmon to a serving platter.