Preheat the oven to 400°F. Line a sheet pan with parchment paper and set aside.
Heat the olive oil in a medium skillet over medium-low heat. Add the onion, salt, and pepper, and sauté until the onion is translucent.
Add the red pepper flakes and garlic; cook for 30 seconds.
Increase heat to medium-high and add the sausage, breaking it up with a spoon. Cook until no longer pink.
Stir in the broccoli and continue cooking until the broccoli is tender and the sausage is browned.
Add the spinach and scallions; cook just until the spinach wilts. Remove from heat.
In a large bowl, whisk together the eggs, cheddar, and hot sauce.
Add the sausage–vegetable mixture, almond flour, coconut flour, and baking powder. Stir with a spatula until combined.
Using a spring-loaded ice cream scoop, portion about 18 biscuits onto the prepared sheet pan. Gently pat the tops to flatten slightly.
Bake for about 15 minutes, or until golden.