Heat your oven to 400°F (200°C). Prepare a 12 cup muffin pan with silicone liners OR by slightly greasing them.
Whisk together the pumpkin, milk, eggs, oil, maple syrup, sugar, pumpkin pie spice and salt in a large bowl.
Fold in the oats and chopped nuts.
Evenly distribute the batter between the prepared muffin cups. Bake in the preheated oven for about 15 minutes or until set. Cool in the pan for 10 minutes, then cool completely on a wire rack.