In a small skillet, add canola oil until about 1 inch deep. Heat oil over medium-high heat.
Once the oil is hot and shimmering, fry corn tortillas one at a time, until golden brown, approximately 1-2 minutes per side.
Remove to a paper towel lined plate to drain and sprinkle with salt. Repeat with the remaining tortillas. Set aside.
Heat a nonstick pan with olive oil over medium-high heat. Once the pan is hot, add chicken. Stir occasionally until chicken is cooked through, about 5 to 7 minutes. Remove from heat.
Spread each tostada with about 2 Tbsp mashed black beans.
Top with chopped chicken, dividing evenly between the tostadas.
Top each with cherry tomatoes, shredded cabbage, avocado, and queso fresco.
Serve immediately with your favorite hot sauce, if desired