Preheat oven to 375°F and grease a 10-inch cast iron skillet. Alternatively, use a 9x13 dish.
Chop and dice all veggies. In a large Dutch oven or saucepan, melt butter over medium-high heat. Add in onions, carrots, celery, and potatoes and cook for 7-8 minutes, until veggies have begun to soften.
Once softened slightly, add onion powder, thyme, salt, and pepper. Then sprinkle with flour, stir, and cook an additional minute.
Slowly add in almond milk and chicken stock, scraping bits off the bottom of the dish. Add in chicken and peas, then bring to a simmer. Let simmer 2-3 minutes, mixture should be thickening up. Turn off heat.
In a large bowl, mix together flour, baking powder, baking soda, and salt. Add in cubed butter and, using your hands or a pastry cutter, blend butter into flour until fine crumbs form.
In a separate small bowl, whisk together yogurt, milk, egg, and honey. Pour into flour and stir until dough forms, don't overmix.
Pour chicken pot pie filling into a skillet. Using a large cookie scoop, scoop biscuit dough onto filling. This should make 6 large biscuits.
Place a baking sheet under skillet and bake for 28-30 minutes or until biscuits are golden brown. It may bubble over a little bit.
Let cool 15 minutes before serving.