Whisk together oil, ranch seasoning, lemon juice, salt, pepper, and red pepper flakes.
Add cauliflower florets. Toss well in mixture.
Spread onto a baking sheet.
Bake in 375°F oven for 30 minutes.
Toss almonds in bowl with any remaining oil, only adding a splash if needed.
Spread onto sheet pan and bake for 1-3 minutes or until lightly golden brown.
Serve roasted cauliflower with freshly chopped parsley, parmesan cheese, and almonds.