Heat large cast iron or other heavy skillet over medium-high heat. Add sausage to skillet and cook 8 minutes or until sausage is almost cooked through, breaking up sausage with back of spoon as it cooks.

Add yellow onion to skillet and cook 3 to 5 minutes or until onion is softened and sausage is cooked all the way through, stirring occasionally.

Reduce heat to medium; push sausage mixture to outside edges of pan. Spray center of pan with cooking spray; pour eggs into center of pan. Cook 1 to 2 minutes or until eggs are hard scrambled, stirring constantly.

Stir in spinach, green onions, rice, peas, maple syrup, soy sauce and pepper. Cook 4 to 5 minutes or until spinach is wilted and everything is warmed through, stirring frequently.

Serve topped with avocado and sriracha, if desired.