Preheat oven to 425 degrees F
Heat butter in dutch oven over medium high heat
Add onion and saute for 3-4 minutes
Add garlic and continue sautéing while stirring 2-3 additional minutes
Stir in 1/4 cup of flour until combined well
Add chicken, veggies, seasoning, broth and dairy and bring to a simmer until sauce thickens
Remove from heat and set aside
Mix together dry ingredients for biscuits
Cut 3 tablespoons of the butter into tiny pieces and then work into dry ingredients using fork until evenly combined
Add milk and combine into a dough
Place dough on a floured surface and roll out to about 3/4 inches thick
Use a biscuit cutter, glass or knife to cut dough into individual biscuits (I used a small juice glass)
Place on top of filling in dutch oven
Place in oven for 10 minutes
Melt remaining 1 tablespoon of butter
Brush over top of biscuits
Return to oven and bake 5 more minutes until biscuits are lightly browned