Slow Cooker Mexican Chili Tostada Stacks

boneless skinless chicken breasts

fire-roasted diced tomatoes ((2 cans))

light red kidney beans, draining and rinsed ((1 can))

pinto beans, draining and rinsed ((1 can))

homemade taco seasoning

dried cilantro

package ((about 12 pre-made tostada shells, you will want about 3 shells per person))

shredded cheeses (like cheddar, monterey jack, or colby)

sour cream

fresh cilantro for garnish (optional)