Add olive oil to a large skillet over medium-high heat. Add onions, kielbasa and garlic and cook it until translucent.
Add chicken broth, tomatoes, coconut milk, Italian seasoning, salt and pepper. Bring to a simmer.
Add gluten free pasta, submerging pasta into simmering liquid. Simmer for 15 minutes, or untill pasta is tender.
Remove skillet from heat and stir in 1 cup cheese substitute.
Top with remaining cheese substitute and sprinkle with sliced onions. Cover and let sit for a couple minute until cheese substitute is melted.
To freeze: Allow to cool. Divide into freezer safe containers, cover, removing as much air as possible, label and freeze.
To serve: Thaw and heat through.